BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 1 of 15
www.murata-ps.com
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For full details go to
www.murata-ps.com/rohs
CONNECTION DIAGRAM
Typical topology is shown.
Murata Power Solutions recommends a fuse at F1.
Typical unit
FEATURES
Small footprint DC/DC converter, ideal for
high current applications
Industry standard 0.96" x 1.1" X 0.35"
open frame package and pinout
Wide range input voltages 9-36 and
18-75 Vdc
Bipolar ±5V, ±12V and ±15V outputs
Up to 15 Watts or greater total output
power with overtemperature shutdown
Isolation up to 2250 VDC (basic), Q48 models
High effi ciency synchronous rectifi er
forward topology
Usable -40 to 85°C temperature range
(with derating)
Assembly and attachment for RoHS standards
Extensive self-protection shut down
features
Meets UL 60950-1, CAN/CSA-
C22.2 No. 60950-1, IEC60950-1,
EN60950-1 safety approvals (2nd Edition)
PRODUCT OVERVIEW
Featuring a full 15 Watt output in one square
inch of board area, the BEI-15 series isolated DC/
DC converter family offers effi cient regulated DC
power for printed circuit board mounting. The
wide range 4:1 inputs on the 0.96" x 1.1" x 0.35"
(24.4 x 27.9 x 8.9 mm) converter are either 9 to 36
Volts DC (Q12 models) or 18 to 75 Volts DC (Q48
models), ideal for battery-powered and telecom
equipment. The industry-standard pinout fi ts larger
1" x 2" converters. Fixed output voltages of ±5,
±12 or ±15 VDC are regulated to within ±0.25%.
Applications include small instruments, area-
limited microcontrollers, data communications
equipment, remote sensor systems, vehicle and
portable electronics.
The BEI-15 series includes full magnetic
and optical isolation with Basic protection up to
2250 Volts DC (Q48 models) and 2000 VDC (Q12
models). For powering digital systems, the outputs
offer fast settling to step transients and will accept
higher capacitive loads. Excellent ripple and noise
specifi cations assure compatibility to noise-sus-
ceptible circuits. For systems requiring controlled
startup/shutdown, an external remote On/Off
control may use a switch, transistor or digital logic.
A wealth of self-protection features avoid both
converter and external circuit faults. These include
input undervoltage lockout and overtemperature
shutdown. The outputs current limit using the
“hiccup” autorestart technique and the outputs
are short-circuit protected. Additional features
include output overvoltage and reverse conduction
elimination. The high effi ciency offers minimal heat
buildup and “no fan” operation.
F1
External
DC
Power
Source
Reference and
Error Amplifier
t4XJUDIJOH
t'JMUFST
t4XJUDIJOH
t'JMUFST -Vout (4)
Common (5)
+Vout (6)
On/Off
Control
(3)
-Vin (2)
Open = On
$MPTFE0GG
+Vin (1)
1PTJUJWF
MPHJD
Controller
and
Power
5SBOTGFS
*TPMBUJPO
Barrier
REG.-Nr. D806
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 2 of 15
www.murata-ps.com/support
PART NUMBER STRUCTURE
‡Some model number combinations may not
be available. See website or contact your local
Murata sales representative.
*Minimum order quantity is required.
Samples available with standard pin
length only.
➀ Please refer to the part number structure for additional options and complete
ordering part numbers.
➁ The minimum output load for the BEI-15W series is 10% of maximum current to
meet published specifications. The converter will not be damaged by less than
10% load but some specs may degrade slightly.
➂ All specifications are at nominal line voltage and full load, +25 °C. unless other-
wise noted. See detailed specifications and notes for full conditions.
Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. The input cap
is 100 μF, low ESR.
I/O caps are necessary for our test equipment and may not be needed for your
application.
➃ RoHS-6 compliance does not claim EU RoHS exemption 7b (lead in solder).
➄ Balanced loads, 10% to 100% loads.
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE ➀
Root Models ➀
Output Input
Effi ciency
Open Frame
Package – C69
VOUT
(V)
IOUT
(mA,
max.)➁
Total
Power
(W)
R/N (mVp-p) Regulation (Max.)
VIN
Nom.
(V)
Range
(V)
IIN =
no
load
(mA)
IIN =
full
load
(mA)Typ. Max. Line Load➄Min. Typ. (inches) (mm)
Case
Pinout
BEI15-050-Q12 ±5 ±1500 15 60 100 ±0.25% ±0.25% 24 9-36 90 740 82.8% 84%
0.96x1.1x0.35 24.4x27.9x8.9 P74
BEI15-050-Q48 ±5 ±1500 15 60 100 ±0.25% ±0.25% 48 18-75 50 374 82% 83.5%
BEI15-120-Q12 ±12 ±625 15 80 120 ±0.25% ±0.25% 24 9-36 95 730 82% 86%
BEI15-120-Q48 ±12 ±625 15 80 120 ±0.25% ±0.25% 48 18-75 50 370 84% 85.5%
BEI15-150-Q12 ±15 ±500 15 100 150 ±0.25% ±0.25% 24 9-36 100 740 83% 84%
BEI15-150-Q48 ±15 ±500 15 100 150 ±0.25% ±0.25% 48 18-75 50 360 84.5% 86%
Nominal Output Voltage
in Tenths of a Volt
Bipolar Wide Input
15-Watt Series
BEI15 -Q12-050 -CRoHS-6 Hazardous
Substance Compliance (note 4)
Input Voltage Range
Q12 = 9-36V
Q48 = 18-75V
P
On/Off Control Logic
P = Positive
N = Negative
X = Control pin omitted‡
H
Conformal Coating Option
Blank = No coating, standard
H = Coating added, optional
(built to order; contact Murata Power Solutions for MOQ and lead times.)*
Lx
Pin Length Option
Blank = Std. pin length 0.25˝ (6.3mm)
L1 = 0.110˝ (2.79mm)*
L2 = 0.145˝ (3.68mm)*
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 3 of 15
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INPUT CHARACTERISTICS BEI15-050-Q12 BEI15-050-Q48 BEI15-120-Q12 BEI15-120-Q48 BEI15-150-Q12 BEI15-150-Q48
Input voltage range See ordering guide
Start-up threshold, Volts typ. 9.0 17.0 9.5 17.0 8.9 17.0
Undervoltage shutdown, Volts 8.5 16.0 8.4 16.2 8.4 16.0
Overvoltage shutdown, Volts none
Refl ected (back) ripple current mA pk-pk 5303030530
Input current
Full load conditions See ordering guide
Inrush transient, A2sec 0.05 0.05 0.05 0.05 0.05 0.05
Output short circuit, mA 50 50 50 50 50 50
Output at min. load, mA 90 50 95 50 30 50
Low line (Vin=min.), Amps 2.03 1.0 2.01 0.97 1.97 0.96
Standby mode, mA (Off, UV, OT shutdown) 2511111
Recommended fuse, Amps 424242
Internal input fi lter type Capacitive
Reverse polarity protection None, install external fuse
Remote On/Off Control
Positive logic ("P" model suffi x) OFF=Gnd pin or
-0.7 to +0.8V max.
ON=open pin or
+10 to +15V max.
Negative logic ("N" model suffi x) OFF=open pin or
+10 to +15V max.
ON=Gnd pin or
-0.7 to +0.8V max.
On/Off Current, mA max. 1
OUTPUT CHARACTERISTICS BEI15-050-Q12 BEI15-050-Q48 BEI15-120-Q12 BEI15-120-Q48 BEI15-150-Q12 BEI15-150-Q48
Voltage output range See ordering guide
Voltage output accuracy, % of Vnom. (50% load) ±1
Temperature coeffi cient, % of Vout range/°C ±0.02
Minimum loading, percent of full power 10
Ripple/noise (20 MHz bandwidth)
See ordering guideLine/Load regulation
Effi ciency
Capacitive loading, μF max.,
low ESR <0.02Ω max., resistive load 500 500 150 150 100 100
Overvoltage protection, Volts
(hiccup auto restart after fault removal) 6.5 7 15.8 16 18 20
OV protection method Magnetic feedback
Isolation voltage
Input to Output, Volts DC min. 2000 2250 2000 2250 2000 2250
Isolation resistance, MΩ min. 10 10 10 10 10 10
Isolation capacitance, pF 1000 1000 600 700 1000 1000
Isolation safety rating Basic insulation
Miscellaneous
Current limit inception, Amps (Vout
actual ≤ 98% of Vnom.) after warmup 2.6 2.5 1 1.1 0.9 0.9
Short circuit protection method Current limiting, hiccup autorestart
Short circuit current, Amps max. 0.3
Short circuit duration (output shorted to ground)➀Continuous
FUNCTIONAL SPECIFICATIONS
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 4 of 15
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DYNAMIC CHARACTERISTICS BEI15-050-Q12 BEI15-050-Q48 BEI15-120-Q12 BEI15-120-Q48 BEI15-150-Q12 BEI15-150-Q48
Start-up time, mS, max. 50 50 50 50 50 50
Vin to Vout regulated, mS, max.
(Remote On/Off to Vout regulated) 50 50 50 60 50 50
Dynamic Load Response (50-75-50% load step)
Settling time 250μSec 250μSec 250μSec 250μSec 250μSec 250μSec
Peak deviation ±100mV ±100mV ±150mV ±150mV ±200mV ±200mV
Switching frequency, KHz 350 305 300 320 330 320
Calculated MTBF, hours >2000000
Operating temperature range
(Ambient, natural convection, with derating,
vertical mount). See Derating graphs. -40 to +85°C
No derating -40 to +70°C
Storage temperature range -55 to +125°C
Thermal protection/shutdown, °C
(measured at PWM) 130
Relative humidity, non-condensing To +85°C/85%
PHYSICAL CHARACTERISTICS
Outline dimensions See mechanical specs
Pin material Copper alloy
Pin diameter 0.040 inches
1.016 mm
Pin Finish Gold plate over nickel underplate
Weight, ounces (grams) 0.352 (10) 0.352 (10) 0.352 (10) 0.352 (10) 0.32 (9.07) 0.32 (9.07)
Electromagnetic interference
(requires external fi lter) Meets EN55022 and CISPR22 with external fi lter
Flammability rating UL 94V-0
Safety (designed to meet)
UL/cUL 60950-1
CSA-C22.2 No.60950-1
IEC/EN 60950-1
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Q12 models
Volts, max.,continuous 36
Volts, transient 100 mS 50
Q48 models
Volts, max.,continuous 75
Volts, transient 100 mS 100
On/Off Control, referred to -Vin
Volts, min. -0.3
Volts, max. 15
Input reverse polarity protection None, install external fuse
Output Current, sustained short circuit Current-limited, see specs
Storage Temperature Range
min. °C. -55
max. °C. +125
Lead Temperature, °C. max.(soldering, ten seconds) See soldering guidelines
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 5 of 15
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PERFORMANCE DATA, BEI15-050-Q12
Effi ciency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Line Voltage and Load Current @ +25°C
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airfl ow is from pin 1 to pin 3)
0.3 0.4 0.5 0.7 0.8 0.9 1.0 1.1 1.3 1.4 1.5
71
73
75
77
79
81
83
85
Load Current (Amps)
Efficiency (%)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
0.5
1.0
1.5
2.0
2.5
3.0
0.3 0.4 0.5 0.7 0.8 0.9 1.0 1.1 1.3 1.4 1.5
Output Load Cu rre nt (Amps)
Power Dissipation (Watts)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
30 35 40 45 50 55 60 65 70 75 80 85
0
1
2
3
Output Current (Amps)
Ambient Temperature (ºC)
0.33 m/s (65 LFM)
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 6 of 15
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PERFORMANCE DATA, BEI15-050-Q48
Effi ciency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Load Current @ +25°C
40
44
48
52
56
60
64
68
72
76
80
84
0.2 0.3 0.4 0.6 0.7 0.8 1.0 1.1 1.2 1.4 1.5
Load Current (Amps)
Efficiency (%)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.2 0.3 0.4 0.6 0.7 0.8 1.0 1.1 1.2 1.4 1.5
Output Load Current (Amps)
Power Dissipation (Watts)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
Maximum Current Temperature Derating at Sea Level
(VIN= 18 to 75V, airfl ow is from pin 1 to pin 2)
Maximum Current Temperature Derating at Sea level
(Vin = 18 to 75V, natural convection)
30 35 40 45 50 55 60 65 70 75 80 85
0
1
2
3
Output Current (Amps)
Ambient Temperature (ºC)
0.33 m/s (65 LFM)
0
1
2
30 35 40 45 50 55 60 65 70 75 80 85
Vin = 18V
Vin = 24V
Vin = 36V
Vin = 48V
Vin = 60V
Vin = 75V
Output Load Current (Amps)
Ambient Temperature (°C)
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 7 of 15
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PERFORMANCE DATA, BEI15-120-Q12
Effi ciency vs. Line Voltage and Load Current @ +25°C
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airfl ow is from pin 1 to pin 3)
71
73
75
77
79
81
83
85
0.13 0.18 0.23 0.28 0.33 0.38 0.43 0.48 0.53 0.58 0.63
Load Current (Amps)
Efficiency (%)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
30 35 40 45 50 55 60 65 70 75 80 85
0.33 m/s (65 LFM)
Output Current (Amps)
Ambient Temperature (ºC)
Power Dissipation vs. Load Current @ +25°C
0.5
1.0
1.5
2.0
2.5
3.0
0.1 0.2 0.2 0.3 0.3 0.4 0.4 0.5 0.5 0.6 0.6
Output Load Current (Amps)
Power Dissipation (Watts)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 8 of 15
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PERFORMANCE DATA, BEI15-120-Q48
Effi ciency vs. Line Voltage and Load Current @ +25°C (Vout = 12V)
Maximum Current Temperature Derating at Sea Level
(VIN=24V, airfl ow is from pin 1 to pin 2)
Maximum Current Temperature Derating at Sea Level
(VIN= 18V, airfl ow is from pin 1 to pin 2)
65
68
71
74
77
80
83
86
0.06 0.12 0.17 0.23 0.29 0.34 0.40 0.45 0.51 0.57 0.62
Load Current (Amps)
Efficiency (%)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
0.50
0.55
0.60
0.65
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Natural Convection
Output Current (Amps)
Ambient Temperature (ºC)
Maximum Current Temperature Derating at Sea Level
(VIN= 75V, airfl ow is from pin 1 to pin 2)
0.50
0.55
0.60
0.65
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current (Amps)
Ambient Temperature (ºC)
0.5 m/s (100 LFM)
0.50
0.55
0.60
0.65
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Output Current (Amps)
Ambient Temperature (ºC)
0.5 m/s (100 LFM)
Maximum Current Temperature Derating at Sea Level
(VIN= 48V, airfl ow is from pin 1 to pin 2)
0.50
0.55
0.60
0.65
20 25 30 35 40 45 50 55 60 65 70 75 80 85
Natural Convection
Output Current (Amps)
Ambient Temperature (ºC)
Power Dissipation vs. Load Current @ +25°C
0.5
1.0
1.5
2.0
2.5
3.0
0.1 0.1 0.2 0.2 0.3 0.3 0.4 0.5 0.5 0.6 0.6
Output Load Current (Amps)
Power Dissipation (Watts)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 9 of 15
www.murata-ps.com/support
PERFORMANCE DATA, BEI15-150-Q12
Effi ciency vs. Line Voltage and Load Current @ +25°C
0.10 0.14 0.18 0.22 0.26 0.30 0.34 0.38 0.42 0.46 0.50
64
66
68
70
72
74
76
78
80
82
84
86
Load Current (Amps)
Efficiency (%)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
Power Dissipation vs. Load Current @ +25°C
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
0.10 0.14 0.18 0.22 0.26 0.30 0.34 0.38 0.42 0.46 0.50
Output Load Current (Amps)
Power Dissipation (Watts)
VIN = 9V
VIN = 12V
VIN = 24V
VIN = 36V
Maximum Current Temperature Derating at Sea Level
(VIN= 9V to 36V, airfl ow is from pin 1 to pin 3)
35 45 55 65 75 85
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Output Current (Amps)
Ambient Temperature (ºC)
0.33 m/s (65 LFM)
Maximum Current Temperature Derating at Sea Level
(Natural convection)
30 35 40 45 50 55 60 65 70 75 80 85
400
410
420
430
440
450
460
470
480
490
500
510
Output Current (mA)
Ambient Temperature (ºC)
Vin = 12 V
Vin = 24 V
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 10 of 15
www.murata-ps.com/support
PERFORMANCE DATA, BEI15-150-Q48
Effi ciency vs. Line Voltage and Load Current @ +25°C Power Dissipation vs. Line Voltage and Load Current @ +25°C
Maximum Current Temperature Derating at Sea Level
(VIN= 18 to 75V, airfl ow is from pin 1 to pin 2)
68
70
72
74
76
78
80
82
84
86
88
0.10 0.14 0.18 0.22 0.26 0.30 0.34 0.38 0.42 0.46 0.50
Load Current (Amps)
Efficiency (%)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
2.50
2.75
3.00
3.25
0.1 0.1 0.2 0.2 0.3 0.3 0.3 0.4 0.4 0.5 0.5
Output Load Current (Amps)
Power Dissipation (Watts)
VIN = 18V
VIN = 24V
VIN = 48V
VIN = 75V
30 35 40 45 50 55 60 65 70 75 80 85
0
0.2
0.4
0.6
0.8
1
Output Current (Amps)
Ambient Temperature (ºC)
0.33 m/s (65 LFM)
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 11 of 15
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MECHANICAL SPECIFICATIONS, OPEN FRAME
0.35 MAX
SEATING PLANE
8.9
0.400
10.16
END VIEW
0.25
6.3
0.475
REF
TOP VIEW
PIN #1
1.10
27.9
0.79
20.1
0.96
24.4
SIDE VIEW
Zero corner cuts for
BEI15-120-Q12 and
BEI15-150-Q12 models.
6X AT PINS 1-6
0.040 0.002 PIN WITH
0.071 0.002 SHOULDER
C
L
BOTTOM VIEW (PIN SIDE)
#4
#1
#2
#5
#6
C
L
C
L
#3
0.400
10.16
0.400
10.16
0.100
2.54
0.200
5.08
0.800
20.32
INPUT/OUTPUT CONNECTIONS
Pin Function
1 Positive Vin
2 Negative Vin
3 On/Off Control *
4 Negative Vout
5 Common Return
6 Positive Vout
*The Remote On/Off can be provided
with either positive (P suffi x) or nega-
tive (N suffi x) logic.
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Case 69
Standard pin length is shown. Please refer to
the Ordering Guide for alternate pin lengths.
Some competitive units may use different pin
numbers; however, the BEI is plug compatible.
Follow the pin FUNCTION when laying out your
PC board.
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 12 of 15
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SECTION A-A
Depth
Pocket
9.5 [.38 in]
19.1 [.75 in]
Notes:
Material: Dow 220 antistat ethafoam1.
(Density: 34-35 kg/m3)
Dimensions: 252 x 252 x 19.1 mm2.
6 x 5 array (30 per tray)
3. All dimensions in millimeters [inches]
4. Tolerances unless otherwise specified: +1/-0
Typ
Typ
R
28.4
177.8
[9.92]
252.0
Typ
6.4
Typ
6.4
6.4
Typ 18.0
5x
Ref
38.1
22.9
190.5
Ref
252.0
[9.92]
25.4
4x 44.5
AA
19.1
Ref
252.0
Ref 252.0
Ref
9.5 deep
Ref
SHIPPING TRAYS AND BOXES, THROUGH-HOLE MOUNT
SHIPPING TRAY DIMENSIONS
Anti-static foam
Label
Label
Each tray is 6 x 5 units
(30 units per tray)
BEI modules are supplied in a 30-piece (6 x 5) shipping tray. The tray is an anti-static closed-cell polyethylene foam. Dimensions are shown below.
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 13 of 15
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.
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 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 poorly
regulated capacitor 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 Delay (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
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 accuracy
band. The specifi cation assumes that the output is fully loaded at maximum
rated current.
Recommended Input Filtering
The user must assure that the input source has low AC impedance to provide
dynamic stability and that the input supply has little or no inductive content,
including long distributed wiring to a remote power supply. The converter will
operate with no additional external capacitance if these conditions are met.
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor should
be a ceramic type such as the Murata GRM32 series or a polymer type. Initial
TECHNICAL NOTES suggested capacitor values are 10 to 22 μF, rated at twice the expected maxi-
mum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no additional
external capacitor. However, the user may install more external output capaci-
tance to reduce the ripple even further or for improved dynamic response.
Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors.
Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in
parallel. Mount these close to the converter. Measure the output ripple under
your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish or
possibly introduce instability. Do not exceed the maximum rated output capaci-
tance listed in the specifi cations.
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 com-
ponents, circuits and layout as shown in the fi gures below. The Cbus and Lbus
components simulate a typical DC voltage bus. Please note that the values of
Cin, Lbus and Cbus may vary according to the specifi c converter model.
C
IN
V
IN
C
BUS
L
BUS
C
IN
= 2 x 100μF, ESR < 700mΩ @ 100kHz
C
BUS
= 1000μF, ESR < 100mΩ @ 100kHz
L
BUS
= 1μH
+INPUT
-INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
Figure 2: Measuring Input Ripple Current
C1
C1 = 1μF
C2 = 10μF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2 R
LOAD
SCOPE
+OUTPUT
+SENSE
-OUTPUT
Figure 3: Measuring Output Ripple and Noise (PARD)
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 14 of 15
www.murata-ps.com/support
Minimum Output Loading Requirements
All models regulate within specifi cation and are stable under 10% minimum
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 shut-
down circuitry. If environmental conditions cause the temperature of the DC/
DC’s to rise above the Operating Temperature Range up to the shutdown tem-
perature, 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 temperature hysteresis to
prevent rapid on/off cycling.
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.
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.
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 Current 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 PWM controller
will shut down. 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 cur-
rent, thereby preventing excessive internal temperatures and/or component
damage.
Remote On/Off Control
The remote On/Off Control can be specifi ed with either logic logic type. Please
refer to the Connection Diagram on page 1 for On/Off connections.
Positive-logic models are enabled when the On/Off pin is left open or is
pulled high to +Vin with respect to –Vin. Therefore, the On/Off control can be
disconnected if the converter should always be on. 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-logic devices are on (enabled) when the On/Off pin 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 pulled high (see Specifi cations) with
respect to –Vin.
Dynamic control of the On/Off function must sink the specifi ed signal current
when brought low and withstand the specifi ed 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
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve your noise and surge response objectives. Excess
external capacitance may cause regulation problems and possible oscillation
or instability.
The maximum rated output capacitance and ESR specifi cation is given for a
capacitor installed immediately adjacent to the converter.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "fl oating." Any
BEI15 model may be confi gured to produce an output of 10V, 24V or 30V (for
±5V, ±12V or ±15V models, respectively) by applying the load across the
+Output and –Output pins, with either output grounded. The Common pin
should be left open. Minimum 20% loading is recommended under these
conditions.
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing 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 dif-
fer; 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 115° C.
Maximum Pot Temperature 270° C.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 6 seconds
BEI15 Series
Isolated Wide Input Bipolar 15-Watt DC/DC Converters
MDC_BEI15W.A16 Page 15 of 15
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/
Emissions Performance
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
Rohde & Schwarz EMI Test Receiver (9KHz – 1000MHz) ESPC
Rohde & Schwarz Software ESPC-1 Ver. 2.20
OHMITE 25W – 1 Ohm resistor combinations
DC Source Programmable DC Power Supply Model 62012P-100-50
Reference Description
L1 1mH, 6A
L3 500μH,10A
C1, C2, C8 2.2μfd
C7 Electrolytic Capacitor 100μfd, 100V
C16, C17 .22μfd
C3, C4 Electrolytic Capacitor 33μfd, 100V
Figure 4. Conducted Emissions Test Circuit
Test Card
UUT
V+
V- Vin-
Vout-
Vin+
Resistive Load
inside a metal
container
Resistive Load
inside a metal
container
Vout+
Gnd
Black C16 C8 C8 C8 C8C8 C8 C7
C3
C4
C17
L3 L1
Resistive Load
Graph 1. Conducted emissions performance with fi lter, CISPR 22, Class B, full load,
for BEI15-150-Q12P-C
Graph 2. Conducted emissions performance without fi lter, CISPR 22, Class B, full
load, for BEI15-150-Q12P-C
[3] Conducted Emissions Test Results
