www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
　
F1
External
DC
Power
Source
Reference and
Error Amplifier
-Vout (4)
+Vout (8)
Trim (6)
On/Off
Control
(2)
-Vin (3)
Open = On
+Vin (1)
logic)
Controller
and Power
Barrier
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions recommends an external fuse.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 1 of 29
FEATURES
Interleaved synchronous rectifi cation yields high
effi ciency over 90%
36 to 75 Vdc input range (48V nominal)
Outstanding thermal performance and derating
Low profi le 0.40" height with 0.9" x 2.3" outline
dimensions
Fully isolated, 2250 Vdc (BASIC) insulation
Industry standard DOSA eighth-brick pinout and
package and surface mount (SMT) option
Extensive self-protection and short circuit
features
On/Off control, trim and sense functions
Fully protected against temperature and voltage
limits
RoHS-6 compliant
UL/IEC 60950-1 and CAN/CSA C22.2 No. 60950-
1, 2nd Edition safety approvals
Units are offered with a fi xed output voltage and
current up to 30 Amps. UEEs operate over a wide
temperature range (up to +85°C at moderate
airfl ow) with full rated power. Synchronous rectifi er
topology yields excellent effi ciency.
UEEs achieve these impressive mechanical and
environmental specs while delivering excellent
electrical performance in an industry standard
DOSA compatible through-hole package or surface
mount option. The unit is fully protected against
input undervoltage, output overcurrent and short
circuit. An on-board temperature sensor shuts
down the converter if thermal limits are reached
and automatically restarts the converter when the
fault is removed.
An On/Off control input enables phased startup
and shutdown in multi-voltage applications. UEEs
include a Sense input to correct for ohmic losses. A
trim input may be connected to a user’s adjustment
potentiometer or trim resistors for output voltage
calibration.
UEEs include industry-standard safety certifi -
cations and BASIC I/O insulation provides input/
output isolation to 2250V. Radiation and conducted
emission testing is performed to widely accepted
EMC standards.
PRODUCT OVERVIEW
Typical units
For effi cient, fully isolated DC power in the smallest space, the UEE
open frame DC-DC converter series fi t in industry-standard “eighth
brick” outline dimensions and mounting pins (on quarter-brick pinout)
or surface mount option.
Output (V) Current (A) Nominal Input (V)
3.3 15 48
3.3 25 48
3.3 30 48
Typical units
Fo
r
op
e
b
r
i
or
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PART NUMBER STRUCTURE
➀ Special quantity order is required; samples available with standard pin length only.
➁ SMT (M) versions not available in sample quantities.
➂ Some model number combinations may not be available. See website or contact your local Murata sales representative.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 2 of 29
Maximum Rated Output
Current in Amps
Eighth-Brick Package
Output Confi guration:
U = Unipolar/Single
Nominal Output Voltage
U EE -/D48-3.3 30
Input Voltage Range:
D48 = 36-75V,
48V nominal
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Model Family
Output Input
Effi ciency Package
VOUT
(V)
IOUT
(A)
Power
(W)
Ripple & Noise
(mVp-p) Regulation (max.) VIN Nom.
(V)
Range
(V)
IIN, no
load
(mA)
IIN, full
load
(A)Typ. Max. Line Load Min. Typ. Case Pinout
UEE-3.3/15-D48 3.3 15 50 50 70 ±0.1% ±0.1% 48 36-75 30 1.15 88% 90% C56 P32
UEE-3.3/25-D48 3.3 25 82.5 30 60 ±0.1% ±0.2% 48 36-75 100 2.29 88% 90% C56 P32
UEE-3.3/30-D48 3.3 30 99 30 60 ±0.1% ±0.2% 48 36-75 100 2.29 88% 90% C56 P32
➀ Please refer to the model number structure for additional ordering part numbers and options.
➁ All specifi cations are typical unless noted. General conditions for Specifi cations are +25 deg.C,
Vin=nominal, Vout=nominal (no trim installed), full rated load. Adequate airfl ow must be supplied
for extended testing under power.
All models are tested and specifi ed with external 1µF and 10 µF paralleled output capacitors and
no external input capacitor. All capacitors are low ESR types. Caps are layout dependent. These
capacitors are necessary to accommodate our test equipment and may not be required in your
applications. All models are stable and regulate within spec under no-load conditions.
➂ Some models are pending safety certifi cation.
H
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional, special quantity order
(not available on SMT models)
C
-
RoHS Hazardous Materials compliance
C = RoHS6 (does not claim EU RoHS exemption 7b–lead in solder), standard
Y = RoHS5 (with lead), optional, special quantity order
N
On/Off Control Logic
N = Negative logic, standard
P = Positive logic, optional
B
Baseplate (optional, not available on UEE-3.3/15-D48 models or SMT models)
Blank = No baseplate, standard
B = Baseplate installed, optional, special quantity order
Lx
Pin Length Option (Through-hole packages only)
Blank = Standard pin length 0.180 inches (4.6mm)
L1 = Pin length 0.110 inches (2.79mm) ➀
L2 = Pin length 0.145 inches (3.68mm) ➀
M
Surface Mount (SMT models cannot accept the baseplate)
Blank = Thru-hole pin mount, no SMT
M = Surface mount (MSL Rating 2a) ➁
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UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 3 of 29
FUNCTIONAL SPECIFICATIONS, UEE-3.3/15-D48
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 0 80 Vdc
Input Voltage, Transient Operating or non-operating,
100 mS max. duration 0 100 Vdc
Isolation Voltage Input to output 2250 Vdc
Input Reverse Polarity None, install external fuse None Vdc
On/Off Remote Control Power on or off, referred to -Vin -0.8 13.5 Vdc
Output Power 050W
Output Current Current-limited, no damage,
short-circuit protected 015A
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied or recommended.
INPUT Conditions ➀ ➂
Operating voltage range 36 48 75 Vdc
Recommended External Fuse Fast blow 10 A
Start-up threshold Rising input voltage 33 34 35 Vdc
Undervoltage shutdown Falling input voltage 31 32 33 Vdc
Overvoltage shutdown None Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type Pi
Input current
Full Load Conditions Vin = nominal 1.15 1.18 A
Low Line Vin = minimum 1.53 1.58 A
Inrush Transient 0.01 0.03 A2-Sec.
Output in Short Circuit 72 100 mA
No Load Iout = minimum, unit = ON 30 50 mA
Standby Mode (Off, UV, OT) 4.6 10 mA
Refl ected (back) ripple current ➁Measured at input with specifi ed fi lter 30 mA, P-P
GENERAL and SAFETY
Effi ciency Vin = 48V, full load 88.0 90.0 %
Vin = min, full load 88.0 90.0 %
Isolation
Isolation Voltage, input to output No baseplate 2250 Vdc
Isolation Voltage, input to baseplate N/A N/A Vdc
Isolation Voltage, output to baseplate N/A N/A Vdc
Insulation Safety Rating basic
Isolation Resistance 10 M
Isolation Capacitance 1000 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1,
IEC 60950-1, 2nd edition Yes
Calculated MTBF Per Telcordia SR-332, issue 1, class 3, ground
fi xed, Tcase = +25°C 2.3 Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 300 330 360 KHz
Startup Time Power on to Vout regulated 10 mS
Startup Time Remote ON to Vout regulated 10 mS
Dynamic Load Response 50-75-50% load step, settling time to within
±1% of Vout 220 300 µSec
Dynamic Load Peak Deviation same as above ±150 ±200 mV
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffi x:
Negative Logic, ON state ON=Ground pin or external voltage -0.8 1 Vdc
Negative Logic, OFF state OFF=Pin open or external voltage 2.5 13.5 Vdc
Control Current sinking 1 2 mA
“P” suffi x:
Positive Logic, ON state ON=Pin open or external voltage 2.5 13.5 V
Positive Logic, OFF state OFF=Ground pin or external voltage -0.8 1 V
Control Current sinking 1 2 mA
BasePlate "B" suffi x N/A
Conformal Coating "H" suffi x optional
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UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 4 of 29
OUTPUT Conditions ➀Minimum Typical/Nominal Maximum Units
Total Output Power 0.0 49.5 50 W
Voltage
Nominal Output Voltage No trim 3.267 3.30 3.333 Vdc
Setting Accuracy At 50% load -1 +1 % of Vset.
Output Voltage Range User-adjustable -10 +10 % of Vnom.
Overvoltage Protection Via magnetic feedback 3.7 4.3 5.1 Vdc
Current
Output Current Range 0.0 15 15 A
Minimum Load No minimum load
Current Limit Inception 98% of Vnom., after warmup 18 22 26 A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within ±1.25%
of Vout 1.97 3 A
Short Circuit Duration
(remove short for recovery) Output shorted to ground, no damage Continuous
Short circuit protection method Current limiting Yes
Regulation
Line Regulation Vin=min. to max., Vout=nom., Iout=nom. ±0.1 % of Vout
Load Regulation Iout=min. to max., Vin=48V ±0.1 % of Vout
Ripple and Noise ➁5 Hz- 20 MHz BW 50 70 mV pk-pk
Temperature Coeffi cient At all outputs ±0.0046 ±0.005 % of Vout./°C
Maximum Capacitive Loading Cap. ESR=<0.02, full resistive load 0 7500 F
Remote Sense Compliance Sense connected at load 10 % of Vout
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate) C56 case 2.3x0.9x0.40 max. Inches
(Please refer to outline drawing) LxWxH 58.4x22.9x10.16 mm
Outline Dimensions (with baseplate) 2.3x0.9x0.50 Inches
58.4x22.9x12.7 mm
Weight No baseplate 1.09 Ounces
No baseplate 31 Grams
With baseplate N/A Ounces
With baseplate N/A Grams
Through Hole Pin Diameter 0.04 & 0.062 Inches
1.016&1.524 mm
Through Hole Pin Material Copper alloy
TH Pin Plating Metal and Thickness Nickel subplate 100-299 µ-inches
Gold overplate 10-31 µ-inches
Baseplate Material Aluminum
ENVIRONMENTAL
Operating Ambient Temperature Range No Derating, 100 LFM, full power, vertical mount -40 85 °C
Operating Case Temperature No derating -40 115 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown Measured in center 115 125 135 °C
Electromagnetic Interference External fi lter is required
Conducted, EN55022/CISPR22 B Class
Relative humidity, non-condensing To +85°C 10 90 %RH
Altitude must derate -1%/1000 feet -500 10,000 feet
-152 3048 meters
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, UEE-3.3/15-D48 (CONT.)
Notes
➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal output voltage and
full load.
General conditions are +25˚ Celsius ambient temperature, near sea level altitude, natural convec-
tion airfl ow.
All models are tested and specifi ed with external parallel 1 µF and 10 µF multi-layer ceramic
output capacitors.
No external input capacitor is used. All capacitors are low-ESR types wired close to the converter.
These capacitors are necessary for our test equipment and may not be needed in the user’s ap-
plication.
➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. Input fi ltering is
Cbus=220 µF, Cin=33 µF and Lbus=12 µH.
➂ All models are stable and regulate to specifi cation under no load.
➃ The Remote On/Off Control is referred to -Vin. For external transistor control, use open collector
logic or equivalent.
➄ NOTICE—Please use only this customer data sheet as product documentation when laying out your
printed circuit boards and applying this product into your application. Do NOT use other materials as
offi cial documentation such as advertisements, product announcements, or website graphics.
We strive to have all technical data in this customer data sheet highly accurate and complete. This cus-
tomer data sheet is revision-controlled and dated. The latest customer data sheet revision is normally
on our website (www.murata-ps.com) for products which are fully released to Manufacturing. Please be
especially careful using any data sheets labeled “Preliminary” since data may change without notice.
The pinout (Pxx) and case (Cxx) designations (typically P32 or C56) refer to a generic family of
closely related information. It may not be a single pinout or unique case outline. Please be aware
of small details which may affect your application and PC board layouts. Study the Mechanical
Outline drawings, Input/Output Connection table and all footnotes very carefully. Please contact
Murata Power Solutions if you have any questions.
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/15-D48
www.murata-ps.com/support
Step Load Transient Response (Vin=48V, Vout=nominal, Cload=0, Iout=75% to 50% of full
load, Ta=+25˚C.) Trace 1=Vout, 100 mV/div., 500 µS/div.
30 35 40 45 50 55 60 65 70 75 80 85
0
2
4
6
8
10
12
14
16
Ambient Temperature (ºC)
Output Current (A)
100 to 400 LFM
0
2
4
6
8
10
12
14
16
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
100 to 400 LFM
15
50
55
60
65
70
75
80
85
90
95
135791113
0
1
2
3
4
5
6
7
8
9
Load Current (A)
Efficiency (%)
Vin = 75V
Vin = 48V
Vin = 36V
Power Dissipation (Vin = 48V)
Power Dissipation (Watts)
UEE-3.3/15-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate, airfl ow is from Vin to Vout)
UEE-3.3/15-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate, airfl ow is from –Vin to +Vin)
UEE-3.3/15-D48 Effi ciency and Power Dissipation @ Ta = +25°C
Step Load Transient Response (Vin=48V, Vout=nominal, Cload=0, Iout=50% to 75% of full
load, Ta=+25˚C.) Trace 1=Vout, 100 mV/div., 500 µS/div.
Step Load Transient Response (Vin=48V, Vout=nominal, Cload=0, Iout=50 to 75 to 50% of
full load, Ta=+25˚C.) Trace 1=Vout, 100 mV/div., 2 mS/div.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 5 of 29
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/15-D48
www.murata-ps.com/support
Power On Start Up (Vin=48V, Vout=nom., Iout=0A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable
Power On Start Up (Vin=48V, Vout=nom., Iout=15A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
Power On Start Up (Vin=48V, Vout=nom., Iout=15A, Cload=7500uF, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable
Output Ripple and noise (Vin=48V, Vout=nom., Iout=15A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
Output Ripple and noise (Vin=48V, Vout=nom., Iout=0A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
Thermal image with hot spot at full load current with 85 °C ambient; air is fl owing at 100
LFM. Air is fl owing across the converter from -Vin to +Vin at 48V input. Identifi able and
recommended maximum value to be verifi ed in application.
Q9, Max temp= 120 °C/IPC9592 derating guidelines.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 6 of 29
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 7 of 29
Emissions Performance, Model UEE-3.3/15-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Spectrum Analyzer – Hewlett Packard HP8594L
Line Impedance Stabilization Network (LISN) – 2 Line V-Networks LS1-15V,
50 Ω, 50 µH
[3] Conducted Emissions Test Results
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Designation Value Part Number Description Vendor
C1 1 µF GRM32ER72A105KA01L SMD Ceramic, 100V, 1000nF,
X7R-1210 Murata
C2 100 nF GRM319R72A104KA01D SMD Ceramic, 100V, 100nF
±10%, X7R-1206 Murata
L1 1320 µH LB16H1324
Common Mode choke,
1320 µH, ±25%, 4A, R5K,
*21*21*12.5mm
High Light
C4, C5 0.022 µF GRM32DR73A223KW01L SMD Ceramic, 1000V, 0.022
µF, ±10%, X7R-1210 Murata
C3 220 µF UHE2A221MHD Alum. electrolytic, 100V, 220
µF, ±10%, long lead Nichicon
C6 Not used Not used for this model
L1
LOAD
C1 C2 C3 C6
C4 C5
External
DC
Power
Source
DC/DC Converter
Ground
-Vsource
NEG.
LINE
POS.
LINE
LISN
UNIT UNDER TEST
Spectrum
Analyzer
Return
++
Figure 2. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class A, full load
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class A, full load
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UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 8 of 29
FUNCTIONAL SPECIFICATIONS, UEE-3.3/25-D48
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 0 80 Vdc
Input Voltage, Transient Operating or non-operating,
100 mS max. duration 0 100 Vdc
Isolation Voltage Input to output 2250 Vdc
Input Reverse Polarity None, install external fuse None Vdc
On/Off Remote Control Power on or off, referred to -Vin 0 13.5 Vdc
Output Power 0 83.3 W
Output Current Current-limited, no damage,
short-circuit protected 025A
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied or recommended.
INPUT Conditions ➀ ➂
Operating voltage range 36 48 75 Vdc
Recommended External Fuse Fast blow 10 A
Start-up threshold Rising input voltage 33 34 35 Vdc
Undervoltage shutdown Falling input voltage 31 32 33 Vdc
Overvoltage shutdown None Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type Pi
Input current
Full Load Conditions Vin = nominal 2.29 2.37 A
Low Line Vin = minimum 3.06 3.16 A
Inrush Transient 0.05 0.6 A2-Sec.
Output in Short Circuit 150 300 mA
No Load Iout = minimum, unit = ON 100 150 mA
Standby Mode (Off, UV, OT) 510mA
Refl ected (back) ripple current ➁Measured at input with specifi ed fi lter 30 mA, P-P
GENERAL and SAFETY
Effi ciency Vin = 48V, full load 88.0 90.0 %
Vin = min, full load 88.0 90.0 %
Isolation
Isolation Voltage, input to output No baseplate 2250 Vdc
Isolation Voltage, input to baseplate With baseplate 1500 Vdc
Isolation Voltage, output to baseplate With baseplate 1500 Vdc
Insulation Safety Rating basic
Isolation Resistance 10 M
Isolation Capacitance 1000 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1,
IEC 60950-1, 2nd edition Yes
Calculated MTBF Per Telcordia SR-332, issue 1, class 3, ground
fi xed, Tcase = +25°C 2.5 Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 320 350 380 KHz
Startup Time Power on to Vout regulated 10 mS
Startup Time Remote ON to Vout regulated 10 mS
Dynamic Load Response 50-75-50% load step, settling time to within
±1% of Vout 150 300 µSec
Dynamic Load Peak Deviation same as above ±150 ±200 mV
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffi x:
Negative Logic, ON state ON=Ground pin or external voltage -0.8 1 Vdc
Negative Logic, OFF state OFF=Pin open or external voltage 2.5 13.5 Vdc
Control Current sinking 1 2 mA
“P” suffi x:
Positive Logic, ON state ON=Pin open or external voltage 2.5 13.5 V
Positive Logic, OFF state OFF=Ground pin or external voltage -0.8 1 V
Control Current sinking 1 2 mA
Base Plate "B" suffi x optional
Conformal Coating "H" suffi x optional
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UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 9 of 29
OUTPUT Conditions ➀Minimum Typical/Nominal Maximum Units
Total Output Power 0.0 82.5 83.3 W
Voltage
Nominal Output Voltage No trim 3.267 3.30 3.333 Vdc
Setting Accuracy At 50% load -1 +1 % of Vset.
Output Voltage Range User-adjustable -10 +10 % of Vnom.
Overvoltage Protection Via magnetic feedback 3.7 4 4.9 Vdc
Current
Output Current Range 0.0 25 25 A
Minimum Load No minimum load
Current Limit Inception 98% of Vnom., after warmup 28 31 34 A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within ±1.25%
of Vout 34A
Short Circuit Duration
(remove short for recovery) Output shorted to ground, no damage Continuous
Short circuit protection method Current limiting Yes
Regulation
Line Regulation Vin=min. to max., Vout=nom., Iout=nom. ±0.1 % of Vout
Load Regulation Iout=min. to max., Vin=48V ±0.2 % of Vout
Ripple and Noise ➁5 Hz- 20 MHz BW 30 60 mV pk-pk
Temperature Coeffi cient At all outputs 0.02 % of Vout./°C
Maximum Capacitive Loading Cap. ESR=<0.02, full resistive load 0 10,000 F
Remote Sense Compliance Sense connected at load 10 % of Vout
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate) C56 case 2.3x0.9x0.40 max. Inches
(Please refer to outline drawing) LxWxH 58.4x22.9x10.16 mm
Outline Dimensions (with baseplate) 2.3x0.9x0.50 Inches
58.4x22.9x12.7 mm
Weight No baseplate 1.09 Ounces
No baseplate 31 Grams
With baseplate TBD Ounces
With baseplate TBD Grams
Through Hole Pin Diameter 0.04 & 0.062 Inches
1.016&1.524 mm
Through Hole Pin Material Copper alloy
TH Pin Plating Metal and Thickness Nickel subplate 100-299 µ-inches
Gold overplate 10-31 µ-inches
Baseplate Material Aluminum
ENVIRONMENTAL
Operating Ambient Temperature Range No Derating, 100 LFM, full power, vertical mount -40 85 °C
Operating Case Temperature No derating -40 125 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown Measured in center 115 125 135 °C
Electromagnetic Interference External fi lter is required
Conducted, EN55022/CISPR22 B Class
Relative humidity, non-condensing To +85°C 10 90 %RH
Altitude must derate -1%/1000 feet -500 10,000 feet
-152 3048 meters
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, UEE-3.3/25-D48 (CONT.)
Notes
➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal output voltage and
full load.
General conditions are +25˚ Celsius ambient temperature, near sea level altitude, natural convec-
tion airfl ow.
All models are tested and specifi ed with external parallel 1 µF and 10 µF multi-layer ceramic
output capacitors.
No external input capacitor is used. All capacitors are low-ESR types wired close to the converter.
These capacitors are necessary for our test equipment and may not be needed in the user’s ap-
plication.
➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. Input fi ltering is
Cbus=220 µF, Cin=33 µF and Lbus=12 µH.
➂ All models are stable and regulate to specifi cation under no load.
➃ The Remote On/Off Control is referred to -Vin. For external transistor control, use open collector
logic or equivalent.
➄ NOTICE—Please use only this customer data sheet as product documentation when laying out your
printed circuit boards and applying this product into your application. Do NOT use other materials as
offi cial documentation such as advertisements, product announcements, or website graphics.
We strive to have all technical data in this customer data sheet highly accurate and complete. This cus-
tomer data sheet is revision-controlled and dated. The latest customer data sheet revision is normally
on our website (www.murata-ps.com) for products which are fully released to Manufacturing. Please be
especially careful using any data sheets labeled “Preliminary” since data may change without notice.
The pinout (Pxx) and case (Cxx) designations (typically P32 or C56) refer to a generic family of
closely related information. It may not be a single pinout or unique case outline. Please be aware
of small details which may affect your application and PC board layouts. Study the Mechanical
Outline drawings, Input/Output Connection table and all footnotes very carefully. Please contact
Murata Power Solutions if you have any questions.
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/25-D48
www.murata-ps.com/support
30 35 40 45 50 55 60 65 70 75 80 85
0
10
20
30
40
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
0
10
20
30
40
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
10
15
20
25
30
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
Natural Convection
0
10
20
30
40
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
30 35 40 45 50 55 60 65 70 75 80 85
5
10
15
20
25
30
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
3691215182124
50
55
60
65
70
75
80
85
90
95
100
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Current (A)
Efficiency (%)
Vin = 75V
Vin = 48V
Vin = 36V
Power Dissipation (Vin = 48V)
Power Dissipation (Watts)
UEE-3.3/25-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate. Airfl ow direction is longitudinal, from Vin to Vout.)
UEE-3.3/25-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate. Airfl ow direction is transverse.)
UEE-3.3/25-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate. Airfl ow direction is transverse.)
UEE-3.3/25-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, with baseplate. Airfl ow direction is transverse from +Vin to -Vin.)
UEE-3.3/25-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, with baseplate. Airfl ow direction is from Vin to Vout.)
UEE-3.3/25-D48 Effi ciency and Power Dissipation @ Ta = +25°C
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 10 of 29
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/25-D48
www.murata-ps.com/support
Step Load Transient Response (Slew=1A / Sec.,Vin=48V., Cload=0, Iout=22.5A to 15A)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=0A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=25A, Cload=10uF, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=25A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
Step Load Transient Response (Slew=1A / Sec.,Vin=48V., Cload=0, Iout=15A to 22.5A)
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 11 of 29
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/25-D48
Thermal image with hot spot at full load current with 85 °C ambient; air is fl owing at 200
LFM. Air is fl owing across the converter from Vin to Vout at 48V input. Identifi able and
recommended maximum value to be verifi ed in application.
T1 & Q1, Max temp= 120 °C/IPC9592 derating guidelines.
www.murata-ps.com/support
Output Ripple and noise (Vin=48V, Vout=nom., Iout=25A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
Output Ripple and noise (Vin=48V, Vout=nom., Iout=25A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 12 of 29
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 13 of 29
Emissions Performance, Model UEE-3.3/25-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Spectrum Analyzer – Hewlett Packard HP8594L
Line Impedance Stabilization Network (LISN) – 2 Line V-Networks LS1-15V,
50 Ω, 50 µH
[3] Conducted Emissions Test Results
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Designation Value Part Number Description Vendor
C1 1 µF GRM32ER72A105KA01L SMD Ceramic, 100V, 1000nF,
X7R-1210 Murata
C2 100 nF GRM319R72A104KA01D SMD Ceramic, 100V, 100nF
±10%, X7R-1206 Murata
L1 1320 µH LB16H1324
Common Mode choke,
1320 µH, ±25%, 4A, R5K,
*21*21*12.5mm
High Light
C4, C5 0.022 µF GRM32DR73A223KW01L SMD Ceramic, 1000V, 0.022
µF, ±10%, X7R-1210 Murata
C3 220 µF UHE2A221MHD Alum. electrolytic, 100V, 220
µF, ±10%, long lead Nichicon
C6 Not used Not used for this model
L1
LOAD
C1 C2 C3 C6
C4 C5
External
DC
Power
Source
DC/DC Converter
Ground
-Vsource
NEG.
LINE
POS.
LINE
LISN
UNIT UNDER TEST
Spectrum
Analyzer
Return
++
Figure 3. Conducted Emissions Test Circuit
Graph 3. Conducted emissions performance, Positive Line,
CISPR 22, Class A, full load
Graph 4. Conducted emissions performance, Negative Line,
CISPR 22, Class A, full load
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 14 of 29
FUNCTIONAL SPECIFICATIONS, UEE-3.3/30-D48
ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous 0 80 Vdc
Input Voltage, Transient Operating or non-operating,
100 mS max. duration 0 100 Vdc
Isolation Voltage Input to output 2250 Vdc
Input Reverse Polarity None, install external fuse None Vdc
On/Off Remote Control Power on or off, referred to -Vin 0 13.5 Vdc
Output Power 0 100 W
Output Current Current-limited, no damage,
short-circuit protected 030A
Storage Temperature Range Vin = Zero (no power) -55 125 °C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Specifi cations Table is not implied or recommended.
INPUT Conditions ➀ ➂
Operating voltage range 36 48 75 Vdc
Recommended External Fuse Fast blow 10 A
Start-up threshold Rising input voltage 33 34 35 Vdc
Undervoltage shutdown Falling input voltage 31 32 33 Vdc
Overvoltage shutdown None Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type Pi
Input current
Full Load Conditions Vin = nominal 2.29 2.37 A
Low Line Vin = minimum 3.06 3.16 A
Inrush Transient 0.05 0.6 A2-Sec.
Output in Short Circuit 150 300 mA
No Load Iout = minimum, unit = ON 100 150 mA
Standby Mode (Off, UV, OT) 510mA
Refl ected (back) ripple current ➁Measured at input with specifi ed fi lter 30 mA, P-P
GENERAL and SAFETY
Effi ciency Vin = 48V, full load 88.0 90.0 %
Vin = min, full load 88.0 90.0 %
Isolation
Isolation Voltage, input to output No baseplate 2250 Vdc
Isolation Voltage, input to baseplate With baseplate 1500 Vdc
Isolation Voltage, output to baseplate With baseplate 1500 Vdc
Insulation Safety Rating basic
Isolation Resistance 10 M
Isolation Capacitance 1000 pF
Safety Certifi ed to UL-60950-1, CSA-C22.2 No.60950-1,
IEC 60950-1, 2nd edition Yes
Calculated MTBF Per Telcordia SR-332, issue 1, class 3, ground
fi xed, Tcase = +25°C 2.5 Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 320 350 380 KHz
Startup Time Power on to Vout regulated 10 mS
Startup Time Remote ON to Vout regulated 10 mS
Dynamic Load Response 50-75-50% load step, settling time to within
±1% of Vout 150 300 µSec
Dynamic Load Peak Deviation same as above ±150 ±200 mV
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffi x:
Negative Logic, ON state ON=Ground pin or external voltage -0.8 1 Vdc
Negative Logic, OFF state OFF=Pin open or external voltage 2.5 13.5 Vdc
Control Current sinking 1 2 mA
“P” suffi x:
Positive Logic, ON state ON=Pin open or external voltage 2.5 13.5 V
Positive Logic, OFF state OFF=Ground pin or external voltage -0.8 1 V
Control Current sinking 1 2 mA
Base Plate "B" suffi x optional
Conformal Coating "H" suffi x optional
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 15 of 29
OUTPUT Conditions ➀Minimum Typical/Nominal Maximum Units
Total Output Power 0.0 99 100 W
Voltage
Nominal Output Voltage No trim 3.267 3.30 3.333 Vdc
Setting Accuracy At 50% load -1 +1 % of Vset.
Output Voltage Range User-adjustable -10 +10 % of Vnom.
Overvoltage Protection Via magnetic feedback 3.7 4 4.9 Vdc
Current
Output Current Range 0.0 30.0 30.0 A
Minimum Load No minimum load
Current Limit Inception 98% of Vnom., after warmup 35 42 49 A
Short Circuit
Short Circuit Current Hiccup technique, autorecovery within ±1.25%
of Vout 34A
Short Circuit Duration
(remove short for recovery) Output shorted to ground, no damage Continuous
Short circuit protection method Current limiting Yes
Regulation
Line Regulation Vin=min. to max., Vout=nom., Iout=nom. ±0.1 % of Vout
Load Regulation Iout=min. to max., Vin=48V ±0.2 % of Vout
Ripple and Noise ➁5 Hz- 20 MHz BW 30 60 mV pk-pk
Temperature Coeffi cient At all outputs 0.02 % of Vout./°C
Maximum Capacitive Loading Cap. ESR=<0.02, full resistive load 0 10,000 F
Remote Sense Compliance Sense connected at load 10 % of Vout
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate) C56 case 2.3x0.9x0.40 max. Inches
(Please refer to outline drawing) LxWxH 58.4x22.9x10.16 mm
Outline Dimensions (with baseplate) 2.3x0.9x0.50 Inches
58.4x22.9x12.7 mm
Weight No baseplate 1.09 Ounces
No baseplate 31 Grams
With baseplate TBD Ounces
With baseplate TBD Grams
Through Hole Pin Diameter 0.04 & 0.062 Inches
1.016&1.524 mm
Through Hole Pin Material Copper alloy
TH Pin Plating Metal and Thickness Nickel subplate 100-299 µ-inches
Gold overplate 10-31 µ-inches
Baseplate Material Aluminum
ENVIRONMENTAL
Operating Ambient Temperature Range No Derating, 100 LFM, full power, vertical mount -40 85 °C
Operating Case Temperature No derating -40 125 °C
Storage Temperature Vin = Zero (no power) -55 125 °C
Thermal Protection/Shutdown Measured in center 115 125 135 °C
Electromagnetic Interference External fi lter is required
Conducted, EN55022/CISPR22 B Class
Relative humidity, non-condensing To +85°C 10 90 %RH
Altitude must derate -1%/1000 feet -500 10,000 feet
-152 3048 meters
RoHS rating RoHS-6
FUNCTIONAL SPECIFICATIONS, UEE-3.3/30-D48 (CONT.)
Notes
➀ Unless otherwise noted, all specifi cations are at nominal input voltage, nominal output voltage and
full load.
General conditions are +25˚ Celsius ambient temperature, near sea level altitude, natural convec-
tion airfl ow.
All models are tested and specifi ed with external parallel 1 µF and 10 µF multi-layer ceramic
output capacitors.
No external input capacitor is used. All capacitors are low-ESR types wired close to the converter.
These capacitors are necessary for our test equipment and may not be needed in the user’s ap-
plication.
➁ Input (back) ripple current is tested and specifi ed over 5 Hz to 20 MHz bandwidth. Input fi ltering is
Cbus=220 µF, Cin=33 µF and Lbus=12 µH.
➂ All models are stable and regulate to specifi cation under no load.
➃ The Remote On/Off Control is referred to -Vin. For external transistor control, use open collector
logic or equivalent.
➄ NOTICE—Please use only this customer data sheet as product documentation when laying out your
printed circuit boards and applying this product into your application. Do NOT use other materials as
offi cial documentation such as advertisements, product announcements, or website graphics.
We strive to have all technical data in this customer data sheet highly accurate and complete. This cus-
tomer data sheet is revision-controlled and dated. The latest customer data sheet revision is normally
on our website (www.murata-ps.com) for products which are fully released to Manufacturing. Please be
especially careful using any data sheets labeled “Preliminary” since data may change without notice.
The pinout (Pxx) and case (Cxx) designations (typically P32 or C56) refer to a generic family of
closely related information. It may not be a single pinout or unique case outline. Please be aware
of small details which may affect your application and PC board layouts. Study the Mechanical
Outline drawings, Input/Output Connection table and all footnotes very carefully. Please contact
Murata Power Solutions if you have any questions.
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/30-D48
www.murata-ps.com/support
0
10
20
30
40
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
0
10
20
30
40
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
0
10
20
30
40
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
30 35 40 45 50 55 60 65 70 75 80 85
5
10
15
20
25
30
Ambient Temperature (ºC)
Output Current (A)
200 LFM
400 LFM
300 LFM
100 LFM
3 6 9 12151821242730
50
55
60
65
70
75
80
85
90
95
100
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Load Current (A)
Efficiency (%)
Vin = 75V
Vin = 48V
Vin = 36V
Power Dissipation (Vin = 48V)
Power Dissipation (Watts)
UEE-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate. Airfl ow direction is longitudinal, from Vin to Vout.)
UEE-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, no baseplate. Airfl ow direction is transverse.)
UEE-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, with baseplate. Airfl ow direction is transverse from +Vin to -Vin.)
UEE-3.3/30-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, with baseplate. Airfl ow direction is from Vin to Vout.)
UEE-3.3/30-D48 Effi ciency and Power Dissipation @ Ta = +25°C
Step Load Transient Response (Slew=1A / Sec.,Vin=48V., Cload=0, Iout=15A to 22.5A)
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 16 of 29
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/30-D48
www.murata-ps.com/support
Step Load Transient Response (Slew=1A / Sec.,Vin=48V., Cload=0, Iout=22.5A to 15A)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=0A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
Output Ripple and noise (Vin=48V, Vout=nom., Iout=30A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=30A, Cload=10uF, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
Output Ripple and noise (Vin=48V, Vout=nom., Iout=30A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz)
On/Off Enable Delay (Vin=48V, Vout=nom., Iout=30A, Cload=0, Ta=+25° C.,
ScopeBW=20Mhz, Trace 2=Vout, Trace 4=Enable.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 17 of 29
TYPICAL PERFORMANCE DATA AND OSCILLOGRAMS, UEE-3.3/30-D48
Thermal image with hot spot at full load current with 85 °C ambient; air is fl owing at 200
LFM. Air is fl owing across the converter from Vin to Vout at 48V input. Identifi able and
recommended maximum value to be verifi ed in application.
T1 & Q1, Max temp= 120 °C/IPC9592 derating guidelines.
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 18 of 29
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 19 of 29
Emissions Performance, Model UEE-3.3/30-D48
Murata Power Solutions measures its products for radio frequency emissions
against the EN 55022 and CISPR 22 standards. Passive resistance loads are
employed and the output is set to the maximum voltage. If you set up your
own emissions testing, make sure the output load is rated at continuous power
while doing the tests.
The recommended external input and output capacitors (if required) are
included. Please refer to the fundamental switching frequency. All of this
information is listed in the Product Specifi cations. An external discrete fi lter is
installed and the circuit diagram is shown below.
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Spectrum Analyzer – Hewlett Packard HP8594L
Line Impedance Stabilization Network (LISN) – 2 Line V-Networks LS1-15V,
50 Ω, 50 µH
[3] Conducted Emissions Test Results
[4] Layout Recommendations
Most applications can use the fi ltering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional fi lter components and/or
shielding. Emissions performance will depend on the user’s PC board layout,
the chassis shielding environment and choice of external components. Please
refer to Application Note GEAN02 for further discussion.
Since many factors affect both the amplitude and spectra of emissions, we
recommend using an engineer who is experienced at emissions suppression.
Designation Value Part Number Description Vendor
C1 1 µF GRM32ER72A105KA01L SMD Ceramic, 100V, 1000nF,
X7R-1210 Murata
C2 100 nF GRM319R72A104KA01D SMD Ceramic, 100V, 100nF
±10%, X7R-1206 Murata
L1 1320 µH LB16H1324
Common Mode choke,
1320 µH, ±25%, 4A, R5K,
*21*21*12.5mm
High Light
C4, C5 0.022 µF GRM32DR73A223KW01L SMD Ceramic, 1000V, 0.022
µF, ±10%, X7R-1210 Murata
C3 220 µF UHE2A221MHD Alum. electrolytic, 100V, 220
µF, ±10%, long lead Nichicon
C6 Not used Not used for this model
L1
LOAD
C1 C2 C3 C6
C4 C5
External
DC
Power
Source
DC/DC Converter
Ground
-Vsource
NEG.
LINE
POS.
LINE
LISN
UNIT UNDER TEST
Spectrum
Analyzer
Return
++
Figure 4. Conducted Emissions Test Circuit
Graph 5. Conducted emissions performance, Positive Line,
CISPR 22, Class A, full load
Graph 6. Conducted emissions performance, Negative Line,
CISPR 22, Class A, full load
www.murata-ps.com/support
MECHANICAL SPECIFICATIONS (THROUGH-HOLE MOUNT)
➀ M3 bolts must not exceed 0.118˝ (3.0mm) depth below the baseplate surface.
➁ Applied screw torque must not exceed 5.3 in-lb. (0.6 N-m).
Standard pin length is shown. Please refer to the part number structure for
alternate pin lengths.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 20 of 29
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only
and may vary between units.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Typical clearance to on-board components
is 0.015˝ (0.38mm). In general, the user
should not place components directly
below the converter.
0.50 (12.7) Max
WITH BASEPLATE OPTION
(Baseplate not available for UEE-3.3/15-D48 models.)
M3-6H TYP 2PL
0.600 (15.24)
0.600 (15.24)
0.600 (15.24)
0.600 (15.24)
BOTTOM PIN SIDE VIEW
3
2
18
6
4
BOTTOM PIN SIDE VIEW
3
2
18
6
4
L
0.40 (10.16) Max
0.136 (3.45) ±0.005
OPEN FRAME (NO BASEPLATE)
TOP VIEW
SIDE VIEW
TOP VIEW
0.015 minimum clearance
between standos and
highest component
PINS 1-3, 5-7:
φ0.040±0.001(1.016±0.025)
PINS 4,8:
φ0.062±0.001(1.575±0.025)
0.18 (4.6)
PIN Shoulder 1-3,
5-7
:
φ0.091±0.003(2.31±0.076)
PIN Shoulder 4,8:
φ0.110±0.003(2.79±0.076)
PIN Shoulder 1-3,
5-7
:
φ0.091±0.003(2.31±0.076)
PIN Shoulder 4,8:
φ0.110±0.003(2.79±0.076)
2.000 (50.8)
2.000 (50.8)
0.600 (15.24)
0.90 (22.9)
2.30 (58.4)
2.000 (50.8)
2.30 (58.4)
0.90 (22.9)
0.300 (7.62)
7
5
0.300 (7.62)
7
5
Package C56
DOSA-Compatible
INPUT/OUTPUT CONNECTIONS
Pin Function P32
1 Positive Input
2 On/Off Control
3 Negative Input
4 Negative Output
5 Negative Sense
6 Output Trim
7 Positive Sense
8 Positive Output
www.murata-ps.com/support
MECHANICAL SPECIFICATIONS (SURFACE MOUNT)
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only
and may vary between units.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
RECOMMENDED PAD LAYOUT (SMD)
0.300
BOTTOM PIN VIEW
3
2
18
7
6
5
4
0.40
(10.16) Max
0.02 minimum clearance
highest component
0.600 (15.24)
0.150
(3.81)
0.600 (15.24)
2.000 (50.8)
2.00 (50.8)
0.90 (22.9)
0.600 (15.24)
0.90 (22.9)
2.30 (58.4)
2.30 (58.4)
0.300
0.600 0.15 (3.8)
0.15 (3.8)
SIDE VIEW,
OPEN FRAME
0.150
(3.81)
0.037
(0.939)
0.085
(2.159)
FINISH:UNDERPLATE WITH 2.54 μm MIN AND 7.6 μm MAX 0F NICKEL,
OVERPLATE WITH 0.10 μm MIN AND 0.30 μm Max OF GOLD.
Do not place components directly below the converter.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 21 of 29
Package C56
DOSA-Compatible
INPUT/OUTPUT CONNECTIONS
Pin Function P32
1 Positive Input
2 On/Off Control
3 Negative Input
4 Negative Output
5 Negative Sense
6 Output Trim
7 Positive Sense
8 Positive Output
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SHIPPING TRAYS AND BOXES (THROUGH-HOLE MOUNT)
SHIPPING TRAY (THROUGH-HOLE MOUNT)
UEE through-hole modules are supplied in a 21-piece (3-by-7) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are
shown below.
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 22 of 29
Anti-static foam
Label Label
For 1–42 pc quantity For 43–84 pc quantity
7.800
(198.1)
1.06
(26.9)
2.400 (61) TYP
9.920
(252)
0.625 (15.9) TYP
-0.062
+0.000
1.300 (33.0) TYP 0.25 CHAMFER TYP (4-PL)
Dimensions in inches (mm)
0.25 R TYP
9.920
(252) +0.000
-0.062
0.735 (18.7)
0.455 (11.6) TYP
0.910 (23.1) TYP
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TAPE AND REEL INFORMATION (SURFACE MOUNT, MSL Rating 2a)
2.693
68.40
SPROCKET
CENTERS
(REF)
2.00 1.260
32.00
PITCH
2.300
58.42
PCB REF
.900
22.86
PCB REF SPROCKET
HOLES
PIN #1 OF
CONVERTER
DC-DC ON POCKET TAPE
'ROUND'
SPROCKET
HOLES
'OBLONG'
1.50mm
PIN #1 INDICATOR
AT EACH POCKET
FEED (UNWIND)
DIRECTION -------
.157
4.00
72.0
2.83
.069
1.75
A
A
2.379
60.43
61.88
2.436
.199
5.06
REF
SECTION A-A
SCALE 2 : 1
.410
10.42
POCKET
DEPTH
COVER TAPE
.978
24.85 11.22
.442
1.043
26.50
2.300
58.42
REF PCB
.900
22.86
REF PCB 32.00
PITCH
FEED (UNWIND)
DIRECTION
-----
13.0" x 72mm WIDE
REEL (REF)
ON POCKET TAPE
DC-DC
CONVERTER
PIN #1 OF
'ROUND'
SPROCKET
HOLES
'OBLONG'
SPROCKET
HOLES
PIN #1 INDICATOR
AT EACH POCKET
FEED (UNWIND)
DIRECTION -------
2.83
72.0
Reel Information
(100 units per reel)
.31
8.00
.75
19.05
.30
7.62
.87
22.10
.30
7.62
.31
8.00
UEE-3.3/25, 3.3/30
PICKUP POINT
#1
#1
UEE-3.3/15
PICKUP POINT
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 23 of 29
www.murata-ps.com/support
Input Fusing
Certain applications and/or safety agencies may require fuses at the inputs of
power conversion components. Fuses should also be used when there is the
possibility of sustained input voltage reversal which is not current-limited. For
greatest safety, we recommend a fast blow fuse installed in the ungrounded
input supply line with a value which is approximately twice the maximum line
current, calculated at the lowest input voltage.
The installer must observe all relevant safety standards and regulations. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
Input Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal body diode will become
forward biased and likely draw excessive current from the power source. If this
source is not current-limited or the circuit appropriately fused, it could cause
permanent damage to the converter. Please be sure to install a properly
rated external input fuse.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the rising input voltage exceeds and remains at the Start-Up Threshold
Voltage (see Specifi cations). Once operating, converters will not turn off until
the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent
restart will not occur until the input voltage rises again above the Start-Up
Threshold. This built-in hysteresis prevents any unstable on/off operation at a
single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as capaci-
tor inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the
operating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Delay
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifi cations) is the time interval between the point when
the rising input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specifi ed regulation
band. Actual measured times will vary with input source impedance, external
input capacitance, input voltage slew rate and fi nal value of the input voltage
as it appears at the converter.
These converters include a soft start circuit to moderate the duty cycle of the
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from inception to Vout regulated
assumes that the converter already has its input voltage stabilized above the
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 24 of 29
TECHNICAL NOTES
THROUGH-HOLE SOLDERING GUIDELINES
Murata Power Solutions recommends the specifi cations below when install-
ing these converters. These specifi cations vary depending on the solder
type. Exceeding these specifi cations may cause damage to the product. Your
production environment may differ; therefore please thoroughly review these
guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products (THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature 115ºC.
Maximum Pot Temperature 270ºC.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105ºC.
Maximum Pot Temperature 250ºC.
Maximum Solder Dwell Time 6 seconds
SMT REFLOW SOLDERING GUIDELINES
The surface-mount refl ow solder profi le shown below is suitable for SAC305
type lead-free solders. This graph should be used only as a guideline. Many
other factors infl uence the success of SMT refl ow soldering. Since your pro-
duction environment may differ, please thoroughly review these guidelines with
your process engineers.
www.murata-ps.com/support
Figure 8. Measuring Output Ripple and Noise (PARD)
C1
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2 R
LOAD
SCOPE
+VOUT
+SENSE
−SENSE
−VOUT
Start-Up Threshold before the On command. The interval is measured from
the On command until the output enters and remains within its specifi ed
regulation band. The specifi cation assumes that the output is fully loaded at
maximum rated current.
Input Source Impedance
These converters will operate to specifi cations without external components,
assuming that the source voltage has very low impedance and reasonable
input voltage regulation. Since real-world voltage sources have fi nite imped-
ance, performance is improved by adding external fi lter components. Some-
times only a small ceramic capacitor is suffi cient. Since it is diffi cult to totally
characterize all applications, some experimentation may be needed. Note that
external input capacitors must accept high speed switching currents.
Because of the switching nature of DC-DC converters, the input of these
converters must be driven from a source with both low AC impedance and
adequate DC input regulation. Performance will degrade with increasing input
inductance. Excessive input inductance may inhibit operation. The DC input
regulation specifi es that the input voltage, once operating, must never degrade
below the Shut-Down Threshold under all load conditions. Be sure to use
adequate trace sizes and mount components close to the converter.
I/O Filtering, Input Ripple Current and Output Noise
All models in this converter series are tested and specifi ed for input refl ected
ripple current and output noise using designated external input/output compo-
nents, circuits and layout as shown in the fi gures below. External input capaci-
tors (Cin in the fi gure) serve primarily as energy storage elements, minimizing
line voltage variations caused by transient IR drops in the input conductors.
Users should select input capacitors for bulk capacitance (at appropriate
frequencies), low ESR and high RMS ripple current ratings. In the fi gure below,
the Cbus and Lbus components simulate a typical DC voltage bus. Your specifi c
system confi guration may require additional considerations. Please note that the
values of Cin, Lbus and Cbus will vary according to the specifi c converter model.
In critical applications, output ripple and noise (also referred to as periodic
and random deviations or PARD) may be reduced by adding fi lter elements
such as multiple external capacitors. Be sure to calculate component tempera-
ture rise from refl ected AC current dissipated inside capacitor ESR.
Floating Outputs
Since these are isolated DC-DC converters, their outputs are “fl oating” with
respect to their input. The essential feature of such isolation is ideal ZERO
CURRENT FLOW between input and output. Real-world converters however do
exhibit tiny leakage currents between input and output (see Specifi cations).
These leakages consist of both an AC stray capacitance coupling component
and a DC leakage resistance. When using the isolation feature, do not allow
the isolation voltage to exceed specifi cations. Otherwise the converter may
be damaged. Designers will normally use the negative output (-Output) as
the ground return of the load circuit. You can however use the positive output
(+Output) as the ground return to effectively reverse the output polarity.
Minimum Output Loading Requirements
All models regulate within specifi cation and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To protect against thermal overstress, these converters include thermal
shutdown circuitry. If environmental conditions cause the temperature of the
DC-DC’s to rise above the Operating Temperature Range up to the shutdown
temperature, an on-board electronic temperature sensor will power down
the unit. When the temperature decreases below the turn-on threshold, the
converter will automatically restart. There is a small amount of hysteresis to
prevent rapid on/off cycling. The temperature sensor is typically located adja-
cent to the switching controller, approximately in the center of the unit. See the
Performance and Functional Specifi cations.
CAUTION: If you operate too close to the thermal limits, the converter may
shut down suddenly without warning. Be sure to thoroughly test your applica-
tion to avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The Derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is acceptable
under increasing forced airfl ow measured in Linear Feet per Minute (“LFM”).
Note that these are AVERAGE measurements. The converter will accept brief
increases in current or reduced airfl ow as long as the average is not exceeded.
Figure 7. Measuring Input Ripple Current
C
IN
V
IN
C
BUS
L
BUS
C
IN
= 33µF, ESR < 700mΩ @ 100kHz
C
BUS
= 220µF, ESR < 100mΩ @ 100kHz
L
BUS
= 12µH
+VIN
−VIN
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 25 of 29
www.murata-ps.com/support
Note that the temperatures are of the ambient airfl ow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low fl ow rates (below about 25 LFM) are similar to “natural
convection,” that is, not using fan-forced airfl ow.
Murata Power Solutions makes Characterization measurements in a closed
cycle wind tunnel with calibrated airfl ow. We use both thermocouples and an
infrared camera system to observe thermal performance. As a practical matter,
it is quite diffi cult to insert an anemometer to precisely measure airfl ow in
most applications. Sometimes it is possible to estimate the effective airfl ow if
you thoroughly understand the enclosure geometry, entry/exit orifi ce areas and
the fan fl owrate specifi cations.
CAUTION: If you exceed these Derating guidelines, the converter may have
an unplanned Over Temperature shut down. Also, these graphs are all collected
near Sea Level altitude. Be sure to reduce the derating for higher altitude.
Output Overvoltage Protection (OVP)
This converter monitors its output voltage for an over-voltage condition. If
the output exceeds OVP limits, the sensing circuit will power down the unit,
and the output voltage will decrease. After a time-out period, the PWM will
automatically attempt to restart, causing the output voltage to ramp up to its
rated value. It is not necessary to power down and reset the converter for the
automatic OVP-recovery restart.
If the fault condition persists and the output voltage climbs to excessive
levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling
is referred to as “hiccup” mode.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your application circuit may need additional protection. In
the extremely unlikely event of output circuit failure, excessive voltage could be
applied to your circuit. Consider using appropriate external protection.
Output Current Limiting
As soon as the output current increases to approximately 125% to 150% of
its maximum rated value, the DC-DC converter will enter a current-limiting
mode. The output voltage will decrease proportionally with increases in output
current, thereby maintaining a somewhat constant power output. This is also
commonly referred to as power limiting.
Current limiting inception is defi ned as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifi cations.
Note particularly that the output current may briefl y rise above its rated value
in normal operation as long as the average output power is not exceeded. This
enhances reliability and continued operation of your application. If the output
current is too high, the converter will enter the short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as the
output current demand increases. If the output voltage drops too low (approxi-
mately 98% of nominal output voltage for most models), the magnetically
coupled voltage used to develop the PWM bias voltage will also drop, thereby
shutting down the PWM controller. Following a time-out period, the PWM will
restart, causing the output voltage to begin rising to its appropriate value.
If the short-circuit condition persists, another shutdown cycle will initiate. This
rapid on/off cycling is called “hiccup mode.” The hiccup cycling reduces the
average output current, thereby preventing excessive internal temperatures
and/or component damage.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
Remote Sense Input (Models UEE-3.3/30-D48 only)
Use the Sense inputs with caution. Sense is normally connected at the load.
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting IR voltage drops along the output wiring and the
current carrying capacity of PC board etch. This output drop (the difference
between Sense and Vout when measured at the converter) should not exceed
0.5V. Consider using heavier wire if this drop is excessive. Sense inputs also
improve the stability of the converter and load system by optimizing the control
loop phase margin.
Note: The Sense input and power Vout lines are internally connected through
low value resistors to their respective polarities so that the converter can
operate without external connection to the Sense. Nevertheless, if the Sense
function is not used for remote regulation, the user should connect +Sense to
+Vout and –Sense to –Vout at the converter pins.
The remote Sense lines carry very little current. They are also capacitively
coupled to the output lines and therefore are in the feedback control loop to
regulate and stabilize the output. As such, they are not low impedance inputs
and must be treated with care in PC board layouts. Sense lines on the PCB
should run adjacent to DC signals, preferably Ground. In cables and discrete
wiring, use twisted pair, shielded tubing or similar techniques.
Any long, distributed wiring and/or signifi cant inductance introduced into the
Sense control loop can adversely affect overall system stability. If in doubt, test
your applications by observing the converter’s output transient response during
step loads. There should not be any appreciable ringing or oscillation. You
may also adjust the output trim slightly to compensate for voltage loss in any
external fi lter elements. Do not exceed maximum power ratings.
Figure 9. Remote Sense Circuit Confi guration
LOAD
Contact and PCB resistance
losses due to IR drops
Contact and PCB resistance
losses due to IR drops
+VOUT
+SENSE
TRIM
−
SENSE
-VOUT
+
VIN
ON/OFF
CONTROL
–VIN
Sense Current
IOUT
Sense Return
IOUT Return
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 26 of 29
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 27 of 29
Please observe Sense inputs tolerance to avoid improper operation:
[Vout(+) −Vout(-)] − [Sense(+) −Sense(-)] ≤ 10% of Vout
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore excessive voltage differences between Vout and Sense
together with trim adjustment of the output can cause the overvoltage protec-
tion circuit to activate and shut down the output.
Power derating of the converter is based on the combination of maximum
output current and the highest output voltage. Therefore the designer must
insure:
(Vout at pins) x (Iout) ≤ (Max. rated output power)
Trimming the Output Voltage
The Trim input to the converter allows the user to adjust the output voltage
over the rated trim range (please refer to the Specifi cations). In the trim equa-
tions and circuit diagrams that follow, trim adjustments use either a trimpot or
a single fi xed resistor connected between the Trim input and either the +Sense
or –Sense terminals. Trimming resistors should have a low temperature coef-
fi cient (±100 ppm/deg.C or less) and be mounted close to the converter. Keep
leads short. If the trim function is not used, leave the trim unconnected. With no
trim, the converter will exhibit its specifi ed output voltage accuracy.
There are two CAUTIONs to observe for the Trim input:
CAUTION: To avoid unplanned power down cycles, do not exceed EITHER
the maximum output voltage OR the maximum output power when setting the
trim. Be particularly careful with a trimpot. If the output voltage is excessive,
the OVP circuit may inadvertantly shut down the converter. If the maximum
power is exceeded, the converter may enter current limiting. If the power is
exceeded for an extended period, the converter may overheat and encounter
overtemperature shut down.
CAUTION: Be careful of external electrical noise. The Trim input is a senstive
input to the converter’s feedback control loop. Excessive electrical noise may
cause instability or oscillation. Keep external connections short to the Trim
input. Use shielding if needed.
Where,
VNOM − VOUT) / VNOM
VNOM is the nominal, untrimmed output voltage.
VOUT is the desired new output voltage.
Do not exceed the specified trim range or maximum power ratings when adjusting trim.
Use 1% precision resistors mounted close to the converter on short leads.
If sense is not installed, connect the trim resistor to the respective VOUT pin.
Trim Down
Connect trim resistor between
trim pin and −Sense
5.11
RTrimDn (k Ω) = − 10.22
Trim Up
Connect trim resistor between
trim pin and +Sense
1.225 ×
5.11 × VNOM × (1+
RTrimUp (k Ω) = − 10.22
− 5.11
Figure 10. Trim Connections Using A Trimpot
LOAD
+VOUT
+VIN
–VIN
ON/OFF
CONTROL
TRIM
+SENSE
–VOUT
–SENSE
Trim Equations
Trim Circuits
Figure 11. Trim Connections To Increase Output Voltages
LOAD
RTRIM UP
+VOUT
+VIN
–VIN
ON/OFF
CONTROL
TRIM
+SENSE
–VOUT
–SENSE
Connect sense to its respective VOUT pin if sense is not used with a remote load.
www.murata-ps.com/support
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 28 of 29
Remote On/Off Control
On the input side, a remote On/Off Control can be specifi ed with either positive
or negative logic logic.
Positive: Models equipped with positive logic are enabled when the On/Off
pin is left open or is pulled high to +Vin with respect to –Vin. An internal bias
current causes the open pin to rise to approximately +13.5V. Some models will
also turn on at lower intermediate voltages (see Specifi cations). Positive-logic
devices are disabled when the On/Off is grounded or brought to within a low
voltage (see Specifi cations) with respect to –Vin.
Negative: Models with negative logic are on (enabled) when the On/Off is
grounded or brought to within a low voltage (see Specifi cations) with respect to
–Vin. The device is off (disabled) when the On/Off is left open or is pulled high
to approximately +13.5V with respect to –Vin.
Dynamic control of the On/Off function should be able to sink the speci-
fi ed signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a fi nite time in milliseconds
(see Specifi cations) between the time of On/Off Control activation and stable,
regulated output. This time will vary slightly with output load type and current
and input conditions.
Output Capacitive Load
These converters do not require external capacitance added to achieve rated
specifi cations. Users should only consider adding capacitance to reduce switch-
ing noise and/or to handle spike current step loads. Install only enough capaci-
tance to achieve noise objectives. Excess external capacitance may cause
regulation problems, slower transient response and possible instability. Proper
wiring of the Sense inputs will improve these factors under capacitive load.
The maximum rated output capacitance and ESR specifi cation is given for a
capacitor installed immediately adjacent to the converter. Any extended output
wiring or smaller wire gauge or less ground plane may tolerate somewhat higher
capacitance. Also, capacitors with higher ESR may use a larger capacitance.
Figure 12. Trim Connections To Decrease Output Voltages
LOAD
RTRIM DOWN
+VOUT
+VIN
–VIN
ON/OFF
CONTROL TRIM
+SENSE
–VOUT
–SENSE
Figure 13. Driving the On/Off Control Pin (suggested circuit)
ON/OFF
CONTROL
-VIN
+VCC
www.murata-ps.com/support
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2013 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
UEE Series
Isolated, High-Density, Eighth-Brick
DOSA Low Profi le DC-DC Converters
MDC_UEE_Series.C01 Page 29 of 29
Figure 14. Vertical Wind Tunnel
IR Video
Camera
IR Transparent
optical window Variable
speed fan
Heating
element
Ambient
temperature
sensor
Airflow
collimator
Precision
low-rate
anemometer
3” below UUT
Unit under
test (UUT)
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared video
camera system, and test instrumentation for accurate airfl ow and
heat dissipation analysis of power products. The system includes
a precision low fl ow-rate anemometer, variable speed fan, power
supply input and load controls, temperature gauges, and adjust-
able heating element.
The IR camera monitors the thermal performance of the Unit
Under Test (UUT) under static steady-state conditions. A special
optical port is used which is transparent to infrared wavelengths.
Both through-hole and surface mount converters are soldered
down to a 10" x 10" host carrier board for realistic heat absorp-
tion and spreading. Both longitudinal and transverse airfl ow
studies are possible by rotation of this carrier board since there
are often signifi cant differences in the heat dissipation in the two
airfl ow directions. The combination of adjustable airfl ow, adjust-
able ambient heat, and adjustable Input/Output currents and
voltages mean that a very wide range of measurement conditions
can be studied.
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airfl ow turbulence. Such turbulence
infl uences the effective heat transfer characteristics and gives
false readings. Excess turbulence removes more heat from some
surfaces and less heat from others, possibly causing uneven
overheating.
Both sides of the UUT are studied since there are different thermal
gradients on each side. The adjustable heating element and fan, built-in
temperature gauges, and no-contact IR camera mean that power supplies
are tested in real-world conditions.