HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
www.murata-ps.com
email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 1 of 13
Murata Power Solutions’ fully isolated HPH series of DC/DC converters affords users a practical solu-
tion for their low-voltage/high-current applications. With an input voltage range of 36 to 75 Volts, the HPH
Series delivers up to 70 Amps of output current from a fully regulated 3.3V output.
Using both surface-mount technology and pla-
nar magnetics, these converters are manufactured
on a 2.3" x 2.4", lead-free, open-frame package
with an industry-standard pinout.
HPH converters utilize a full-bridge, fi xed-
frequency topology along with synchronous output
rectifi cation to achieve a high effi ciency. This
effi ciency, coupled with the open-frame package
that allows unrestricted air fl ow, reduces internal
component temperatures thereby allowing operation
at elevated ambient temperatures.
These DC/DC’s provide output trim, sense pins
and primary side on/off control (available with posi-
tive or negative logic). Standard features also include
input undervoltage shutdown circuitry, output
overvoltage protection, output short-circuit and
current limiting protection and thermal shutdown.
All devices are certifi ed to IEC/UL/EN60950-1, 2nd
Edition safety standards and carry the CE mark
(meet LVD requirements).
PRODUCT OVERVIEW
Typical unit
SWITCH
CONTROL
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
PULSE
TRANSFORMER
+Vin
(4)
–Vin
(1)
REMOTE
ON /OFF
CONTROL*
(3)
Vout
TRIM
(7)
–SENSE
(8)
–Vout
(9)
+Vout
(5)
+SENSE
(6)
Input undervoltage, input
overvoltage, and output
overvoltage comparators
* Can be ordered with positive (standard) or negative (optional) polarity.
Typical topology is shown. Some models may vary slightly.
FEATURES
RoHS Compliant
3.3V to 12V outputs @ up to 70 Amps
Input range: 36V-75V
Open Frame: 2.3" x 2.4" x 0.40"
Industry-standard package/pinout
Remote sense, Trim, On/Off control
High effi ciency: up to 91%
Fully isolated, 2250Vdc (BASIC)
Input undervoltage shutdown
Output overvoltage protection
Short circuit protection, thermal shutdown
Certifi ed to UL/EN/IEC 60950-1, 2nd Edition,
CAN/CSA-C22.2 No. 60950-1 safety approvals
CE mark
Optional baseplate offers increased thermal
performance
Contents Page
Description, Photograph, Connection Diagram 1
Ordering Guide, Model Numbering 2
Mechanical Specs, Input/Output Pinout 3
Detailed Electrical Specifi cations, Soldering Guidelines 4
Application Notes 6
Performance Data 11
Figure 1. Simplifi ed Schematic
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
PART NUMBER STRUCTURE
Note: Because of the high currents, wire the appropriate input, output and common pins in parallel. Be sure to use adequate PC board etch. If not suffi cient, install additional discrete wiring.
M Please refer to the full model number structure for additional ordering part numbers and options.
N All specifi cations are at nominal line voltage and full load, +25ºC. unless otherwise noted. See detailed specifi cations.
O Full power continuous output requires baseplate installation. Please refer to the derating curves.
17 Sep 2010 MDC_HPH_A18 Page 2 of 13
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
Root Model M
Output Input
Effi ciency Package
(Case/
Pinout)
VOUT
(Volts)
IOUT
(Amps,
Max.)
Power R/N (mV pk-pk) Regulation (Max.) VIN Nom.
(Volts)
Range
(Volts)
IIN, no
load
(mA)
IIN, full
load
(Amps)
(Watts) Typ. Max. Line Load Min. Typ.
HPH-3.3/70-D48N-C 3.3 70 e231 100 125 ±0.25% ±0.25% 48 36-75 70 5.35 88% 90% C61 P17
HPH-5/40-D48N-C 5 40 200 100 125 ±0.25% ±0.25% 48 36-75 70 4.58 90% 91% C61 P17
HPH-12/30-D48N-C 12 30 360 Please refer to the separate HPH-12/30-D48 data sheet.
Nominal Output Voltage
3.3
HPH 70-/D48
Maximum Output Current
in Amps
Unipolar
High-Power Series
-NHH LxB
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional, special quantity order
Pin length option
Blank = standard pin length 0.180 in. (4.6 mm)
L1 = 0.110 in. (2.79 mm)*
L2 = 0.145 in. (3.68 mm)*
*Special quantity order required
-C
RoHS Hazardous Materials compliance
C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder
Y = RoHS-5 (with lead), optional, special quantity order
Note: Some model combinations may not be
available. Contact Murata Power Solutions for
availability.
On/Off Control Polarity
N = Negative polarity, standard
P = Positive polarity, optional
Baseplate (optional)
Blank = No baseplate, standard
B = Baseplate installed, optional quantity order
Preferred location
of On/Off control
adjacent to -Vin
terminal
DC/DC Converter
Install separate
return wire for
On/Off control
with remote
transistor
On/Off
Control
Transistor
Do not connect
control transistor
through remote
power bus
Ground plane or power return bus
+ Vin
On/Off Enable
-Vin return
Figure 2. On/Off Enable Control Ground Bounce Protection
On/Off Enable Control Ground Bounce Protection
To improve reliability, if you use a small signal transistor or other external
circuit to select the Remote On/Off control, make sure to return the LO side
directly to the –Vin power input on the DC/DC converter. To avoid ground
bounce errors, do not connect the On/Off return to a distant ground plane or
current-carrying bus. If necessary, run a separate small return wire directly to
the –Vin terminal. There is very little current (typically 1-5 mA) on the On/Off
control however, large current changes on a return ground plane or ground bus
can accidentally trigger the converter on or off. If possible, mount the On/Off
transistor or other control circuit adjacent to the converter.
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 3 of 13
MECHANICAL SPECIFICATIONS
Since there is some pin numbering inconsistency between manufacturers of half brick converters,
be sure to follow the pin function, not the pin number, when laying out your board.
Standard pin length is shown. Please refer to the Part Number Structure for special order pin
lengths.
* Note that the “case” connects to the baseplate (when installed). This case connection is isolated
from the rest of the converter. Pin 2 may be deleted under special order. Please contact Murata
Power Solutions for information.
The Trim connection may be left open and the converter will achieve its rated output voltage.
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 ± 2˚
INPUT/OUTPUT CONNECTIONS
Pin Function P17
1 Negative Input
2 Case*
3 On/Off Control
4 Positive Input
5 Positive Output
6 Positive Sense
7 Trim
8 Negative Sense
9 Negative Output
Pin 2 may be removed under special order.
Please contact Murata Power Solutions.
Bottom View
1
2
3
45
6
7
8
9
1.900
(48.26)
2.30
(58.4)
0.40
(10.2)
0.18
(4.57)
0.20
(5.1)
0.015 min. clearance
between standoffs and
highest component
0.400
(10.16)
0.700
(17.78)
0.50
(12.70)
1.000
(25.40)
1.400
(35.56)
2.40
(60.96)
Pin Diameters:
Pins 1-4, 6-8 0.040 ± 0.001 (1.016 ±0.025)
Pins 5, 9 0.080 ± 0.001 (2.032 ±0.025)
HPH with Optional Baseplate
0.18
(4.6)
0.50
(12.7)
2.40
(61.0)
2.00
(50.8)
1.90 (48.3)
2.30 (58.4)
0.015 minimum
clearance between
standoffs and
highest component
Do not remove
M3 x 0.50
threaded inserts
from bottom PCB
User’s thermal surface and hardware
Recommended threaded insert torque
is 0.35-0.55 N-M or 3-5 in-lbs.
M3 x 0.50
threaded insert
and standoff (4 places)
Screw length must
not go through Baseplate
Baseplate
Case C61
A
B
A
B
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 4 of 13
INPUT CHARACTERISTICS
Model Family
Start-up
threshold Un-
dervolt-
age
Shut-
down12
Refl ected
(back) Ripple
Current
Input Current 1
Internal
Input
Filter Type
Reverse
Polarity
Protection16
Remote On/Off Control 6
Typ.
Inrush
Tran-
sient
Output
Short
Circuit
No
Load
Low
Line
Standby
Mode
Current
(Max.) Positive Logic Negative Logic
V V mA pk-pk A2sec mA mA A mA mA “P” model suffi x “N” model suffi x
HPH-3.3/70-D48 35 33.5 20 0.1 50 70 7.13 1
Pi-type See notes
2
OFF=Gnd. pin to
+1V Max.
ON=open pin or
+3.5 to +13.5V
Max.
OFF=open pin or
+3.5V to +13.5V
Max.
ON=Gnd. pin to
+1V Max.
HPH-5/40-D48 35 33.5 20 0.05 50 70 6.11 4 2
OFF=Gnd. pin to
+1V Max.
ON=open pin or
+3.5 to +13.5V
Max.
OFF=open pin or
+3.5V to +13.5V
Max.
ON=Gnd. pin to
+1V Max.
OUTPUT CHARACTERISTICS
Model Family
VOUT
Accuracy
Adjustment
Range 8
Temperature
Coeffi cient
Capacitance
Loading
Overvoltage
Protection 10 15 Over-
Voltage
Protection
Method
Remote Sense
Compensation 11
Minimum
Loading
Ripple/
Noise 9
Line/Load
Regulation 7Effi ciency
50% Load % of
VNOM
% of VOUT
range/ºC
Low ESR <0.02
Max., resistive
load
Hiccup auto
restart after
fault removal
Max. (20 MHz
bandwidth)
% of VNOM μF V % of VOUT
HPH-3.3/70-D48 ±1 ±10 ±0.02 10,000 4 Magnetic
feedback +10
No
minimum
load
See ordering guide
HPH-5/40-D48 ±1 ±10 ±0.02 10,000 6
ISOLATION CHARACTERISTICS
Model Family
Input to
Output
Input
to baseplate
Baseplate
to output Isolation
Resistance
Isolation
Capacitance Isolation
Safety
Rating
Current Limit Inception Short Circuit
Protection
Method
Short Circuit
Current
Min. Min. Min. 98% of VOUT, after warmup Continuous
V V V MΩ pF AA
HPH-3.3/70-D48
2250 1500 1500 100 2000 Basic
Insulation
84 Current
limiting,
hiccup
autorestart
12
HPH-5/40-D48 45 hiccup17
See notes on page 5.
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 ca-
tions 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: For Sn/Pb based solders:
Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 5 of 13
DYNAMIC CHARACTERISTICS
Dynamic Load Response, μSec to ±1% fi nal value, (50-75-50%, load step) HPH-3.3/70-D48 150μS
HPH-5/40-D48 200μS
Start-up Time, VIN to VOUT HPH-3.3/70-D48, HPH-5/40-D48 10 mS
Remote On/Off to VOUT regulated (Max.) HPH-3.3/70-D48, HPH-5/40-D48 10 mS
Switching Frequency HPH-3.3/70-D48 450 KHz
HPH-5/40-D48 440 KHz
Calculated MTBF TDB
Operating Temperature Range -40 to +85ºC, see derating curves
Storage Temperature Range -55 to +125ºC
Thermal Protection/Shutdown 120ºC
Relative Humidity To +85ºC/85%, non condensing
Pre-biased Startup VOUT must be ≤ VSET
PHYSICAL CHARACTERISTICS
Outline Dimensions See mechanical specs
Baseplate Material Aluminum
Pin Material Copper alloy
Pin Diameter 0.04/0.08" (1.016/2.032mm)
Pin Finish Nickel underplate with gold overplate
Weight 2 ounces (56.7g)
Electromagnetic Interference (conducted and radiated) (may require external fi lter) Class B, EN55022/CISPR22
Safety Certifi ed to UL/cUL 60950-1, CSA-C22.2 No.60950-1,
IEC/EN 60950-1, 2nd Edition
ABSOLUTE MAXIMUM RATINGS
Input Voltage Volts, Min. -0.3V
Volts, Max. Continuous 75V continuous
On/Off Control, referred to -VIN Volts, Min. -0.3V
Volts, Max. +15V
Input Reverse Polarity Protection See fuse section
Output Overvoltage, Max. VOUT + 20%
Storage Temperature Min. -55ºC
Max. 125ºC
[1] All specifi cations are typical unless noted. Ambient temperature = +25 degrees Celsius, Vin is
nominal (+48 Volts), output current is maximum rated nominal. Output capacitance is 1 μF ceramic
paralleled with 10 μF electrolytic. Input caps are 22 μF except HPH-3.3/70-D48 which is 100 μF input.
All caps are low ESR. These capacitors are necessary for our test equipment and may not be needed
in your application.
Testing must be kept short enough that the converter does not appreciably heat up during testing. For
extended testing, use plenty of airfl ow. See Derating Curves for temperature performance. All models
are stable and regulate within spec without external cacacitance.
[2] Input Ripple Current is tested and specifi ed over a 5-20 MHz bandwidth and uses a special set of
external fi lters only for the Ripple Current specifi cations. Input fi ltering is Cin = 33 μF, Cbus = 220 μF,
Lbus = 12 μH except HPH-3.3/70-D48 is Cin = 100μF. Use capacitor rated voltages which are twice
the maximum expected voltage. Capacitors must accept high speed AC switching currents.
[3] Note that Maximum Current Derating Curves indicate an average current at nominal input voltage.
At higher temperatures and/or lower airfl ow, the converter will tolerate brief full current outputs if the
total RMS current over time does not exceed the Derating curve.
[4] Mean Time Before Failure (MTBF) is calculated using the Telcordia (Belcore) SR-332 Method 1,
Case 3, ground fi xed conditions. TPCBOARD = +25 °C., full output load, natural air convection.
[5] The output may be shorted to ground indefi nitely with no damage.
6] The On/Off Control is normally driven from a switch or relay. An open collector/open drain transistor
may be used in saturation and cut-off (pinch-off) modes. External logic may also be used if voltage
levels are fully compliant to the specifi cations.
[7] Regulation specifi cations describe the deviation as the input line voltage or output load current is
varied from a nominal midpoint value to either extreme.
[8] Do not exceed maximum power ratings, Sense limits or output overvoltage when adjusting output
trim values.
[9] At zero output current, Vout may contain components which slightly exceed the ripple and noise
specifi cations.
[10] Output overload protection is non-latching. When the output overload is removed, the output will
automatically recover.
[11] Because of the high currents, wire the appropriate input, output and common pins in parallel
groups. Be sure to use adequate PC board etch. If not suffi cient, install additional discrete wiring. If
wiring is not suffi cient, the Sense feedback may attempt to drive the outputs beyond ratings.
[12] The converter will shut off if the input falls below the undervoltage threshold. It will not restart
until the input exceeds the Input Start Up Voltage.
[13] Please refer to the separate output capacitive load application note from Murata Power Solutions.
[14] Output noise may be further reduced by installing an external fi lter. See the Application Notes.
[15] To avoid damage or unplanned shutdown, avoid sinking reverse output current.
[16] To protect against accidental input voltage polarity reversal, install a fuse in series with +Vin. See
Fusing information.
[17] HPH-5/40-D48 full current hiccup is approximately 3% duty cycle, 0.8 Hz pulse rate.
SPECIFICATION NOTES
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 6 of 13
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 Reverse-Polarity Protection
If the input voltage polarity is reversed, an internal 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 perma-
nent damage to the converter.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate properly
until the ramping-up 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 opera-
tion at a single input voltage.
Users should be aware however of input sources near the Under-Voltage Shut-
down whose voltage decays as input current is consumed (such as capacitor
inputs), the converter shuts off and then restarts as the external capacitor
recharges. Such situations could oscillate. To prevent this, make sure the oper-
ating input voltage is well above the UV Shutdown voltage AT ALL TIMES.
Start-Up Time
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 ramping input voltage crosses the Start-Up Threshold and the fully loaded
regulated output voltage enters and remains within its specifi ed accuracy 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 its
PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated as-
sumes 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. Similar conditions apply to the On to Vout regulated specifi cation
such as external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifi cations without external components,
assuming that the source voltage has very low impedance and reasonable in-
put voltage regulation. Since real-world voltage sources have fi nite impedance,
APPLICATION NOTES performance is improved by adding external fi lter components. Sometimes 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 capacitors
(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
C
IN
V
IN
C
BUS
L
BUS
C
IN
= 33μF, ESR < 700mΩ @ 100kHz
C
BUS
= 220μF, ESR < 100mΩ @ 100kHz
L
BUS
= 12μH
4
1
+INPUT
-INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
Figure 3. Measuring Input Ripple Current
random deviations or PARD) may be reduced by adding fi lter elements such
as multiple external capacitors. Be sure to calculate component temperature
rise from refl ected AC current dissipated inside capacitor ESR. Our Application
Engineers can recommend potential solutions.
In fi gure 4, the two copper strips simulate real-world printed circuit impedanc-
es between the power supply and its load. In order to minimize circuit errors
and standardize tests between units, scope measurements should be made
using BNC connectors or the probe ground should not exceed one half inch and
soldered directly to the fi xture.
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 7 of 13
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
These converters employ a synchronous rectifi er design topology. All models
regulate within specifi cation and are stable under no load to full load condi-
tions. Operation under no load might however slightly increase output ripple
and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, 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 adjacent 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 application to
avoid unplanned thermal shutdown.
Temperature Derating Curves
The graphs in the next section 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 temperature and/or current or reduced airfl ow as long as the aver-
age 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 convec-
tion”, that is, not using fan-forced airfl ow.
MPS 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 un-
derstand the enclosure geometry, entry/exit orifi ce areas and the fan fl owrate
specifi cations. If in doubt, contact MPS to discuss placement and measurement
techniques of suggested temperature sensors.
CAUTION: If you routinely or accidentally exceed these Derating guidelines, the
converter may have an unplanned Over Temperature shut down. Also, these
graphs are all collected at slightly above Sea Level altitude. Be sure to reduce
the derating for higher density altitude.
Output Overvoltage Protection
This converter monitors its output voltage for an over-voltage condition using
an on-board electronic comparator. The signal is optically coupled to the pri-
mary side PWM controller. 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 volt-
age to ramp up to its rated value. It is not necessary to power down and reset
the converter for this 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. It safely tests full current rated output voltage
without damaging the converter.
Output Fusing
The converter is extensively protected against current, voltage and temperature
extremes. However your output application circuit may need additional protec-
tion. In the extremely unlikely event of output circuit failure, excessive voltage
could be applied to your circuit. Consider using an appropriate fuse in series
with the output.
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 com-
monly 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. 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, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller. Following a time-out period,
Figure 4. Measuring Output Ripple and Noise (PARD)
C1
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2 R
LOAD
6
5
COPPER STRIP
COPPER STRIP
SCOPE
+OUTPUT
+SENSE
9
8
-SENSE
-OUTPUT
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
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17 Sep 2010 MDC_HPH_A18 Page 8 of 13
the PWM will restart, causing the output voltage to begin ramping up to its ap-
propriate value. If the short-circuit condition persists, another shutdown cycle
will initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling
reduces the average output current, thereby preventing excessive internal
temperatures. A short circuit can be tolerated indefi nitely.
Remote Sense Input
Sense inputs compensate for output voltage inaccuracy delivered at the load.
This is done by correcting voltage drops along the output wiring such as mod-
erate IR drops and the current carrying capacity of PC board etch. 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
Please observe Sense inputs tolerance to avoid improper operation:
[Vout(+) –Vout(-)] – [ Sense(+) – Sense(-)] ≤ 10% of Vout
a single fi xed resistor connected between the Trim input and either the +Sense
or –Sense terminals. (On some converters, an external user-supplied precision
DC voltage may also be used for trimming). Trimming resistors should have a
low temperature coeffi 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 CAUTION’s to be aware 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 overtem-
perature 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. Also consider adding a small value ceramic
capacitor between the Trim and –Vout to bypass RF and electrical noise.
Figure 5. Remote Sense Circuit Confi guration
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 out-
put 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
LOAD
5
8
7
6
9
Contact and PCB resistance
losses due to IR drops
Contact and PCB resistance
losses due to IR drops
+OUTPUT
+SENSE
TRIM
-SENSE
-OUTPUT
-INPUT
ON/OFF
CONTROL
+INPUT
1
3
4
Sense Current
IOUT
Sense Return
IOUT Return Figure 6. Trim adjustments using a trimpot
LOAD
5
8
7
6
5-22
TURNS
1
3
49
+OUTPUT
+SENSE
TRIM
-SENSE
-OUTPUT
-INPUT
ON/OFF
CONTROL
+INPUT
Figure 7. Trim adjustments to Increase Output Voltage using a Fixed Resistor
LOAD
5
8
7
6
RTRIM UP
1
3
49
+OUTPUT
+SENSE
TRIM
-SENSE
-OUTPUT
-INPUT
ON/OFF
CONTROL
+INPUT
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 9 of 13
Trim Equations
Where Vref = +1.225 Volts and Δ is the desired output voltage change. Note
that "Δ" is given as a small fraction, not a percentage.
A single resistor connected between Trim and +Sense will increase the output
voltage. A resistor connected between Trim and –Sense will decrease the output.
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
Positive: Standard models 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 +Vin. Some models will also turn on at lower intermediate
voltages (see Specifi cations). Positive-polarity devices are disabled when the
On/Off is grounded or brought to within a low voltage (see Specifi cations) with
respect to –Vin.
Negative: Optional negative-polarity devices 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 pulled high to +Vin with
respect to –Vin.
Figure 8. Trim adjustments to Decrease Output Voltage using a Fixed Resistor
Figure 9. Driving the Positive Polarity On/Off Control Pin
Figure 10. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the On/Off function should be able to sink appropriate sig-
nal 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.
There are two CAUTIONs for the On/Off Control:
CAUTION: While it is possible to control the On/Off with external logic if you
carefully observe the voltage levels, the preferred circuit is either an open
drain/open collector transistor or a relay (which can thereupon be controlled by
logic).
CAUTION: Do not apply voltages to the On/Off pin when there is no input power
voltage. Otherwise the converter may be permanently damaged.
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 customer 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 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 (such as Sense pins, Power Good pins, etc.)
or slightly different dimensions (baseplates, heat sinks, etc.) 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.
1
3
4
5
8
7
6
9
+OUTPUT
+SENSE
TRIM
-SENSE
-OUTPUT
-INPUT
ON/OFF
CONTROL
+INPUT
LOAD
RTRIM DOWN
1
3
4
ON/OFF
CONTROL
-INPUT
+INPUT +VCC
Radj_up (in kΩ) = - - 2
Vnominal x (1+Δ) 1
Δ
1.225 x Δ
where Δ = Vnominal -Vout
Vnominal
Radj_down (in kΩ) = - 2
1
Δ
where Δ = Vout -Vnominal
Vnominal
ON/OFF CONTROL
CONTROL
+ Vcc
-INPUT
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 10 of 13
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Vertical Wind Tunnel
Murata Power Solutions employs a custom-designed enclosed
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 adjustable heating
element.
The IR camera can watch thermal characteristics of the Unit
Under Test (UUT) with both dynamic loads and static steady-
state conditions. A special optical port is used which is transpar-
ent to infrared wavelengths. The computer fi les from the IR
camera can be studied for later analysis.
Both through-hole and surface mount converters are soldered
down to a host carrier board for realistic heat absorption 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 both adjustable airfl ow, adjustable
ambient heat and adjustable Input/Output currents and voltages
mean that a very wide range of measurement conditions can be
studied.
The airfl ow collimator mixes the heat from the heating element
to make uniform temperature distribution. The collimator also
reduces the amount of turbulence adjacent to the UUT by restor-
ing laminar airfl ow. Such turbulence can change the effective
heat transfer characteristics and give 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.
Figure 11. Vertical Wind Tunnel
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 11 of 13
Figure 12. Transient Response (25% Load Step) Figure 13. Transient Response (50% Load Step)
Figure 14. Enable Start-up (VIN=48V IOUT=0A) Figure 15. Enable Start-up (VIN=48V IOUT=70A)
Figure 16. Ripple Waveform (VIN=48V IOUT=0A) Figure 17. Ripple Waveform (VIN=48V IOUT=70A)
Transient Response – Model HPH-3.3/70-D48
Enable Start-up – Model HPH-3.3/70-D48
Ripple and Noise (1uF Ceramic plus 10uF Tantalum) – Model HPH-3.3/70-D48
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
www.murata-ps.com email: sales@murata-ps.com
17 Sep 2010 MDC_HPH_A18 Page 12 of 13
Typical Performance Curves
70
72
74
76
78
80
82
84
86
88
90
92
94
96
0 5 10 15 20 25 30 35 400
2
4
6
8
10
12
14
16
18
20
22
24
26
HPH-5/40-D48
Efficiency and Power Dissipation Vs. Load Current @ +25ºC
Efficiency (%)
Load Current (Amps)
Loss (Watts)
VIN = 75V
VIN = 48V
VIN = 36V
Power Dissipation @ VIN = 48V
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
30 35 40 45 50 55 60 65 70 75 80
Ambient Temperature (ºC)
Output Current (Amps)
HPH-5/40-D48 Maximum Current Temperature Derating
(V
IN
=48V, Airflow is from V
IN
to V
OUT
, no baseplate)
100 LFM
200 LFM
300 LFM
400 LFM
10
15
20
25
30
35
40
45
50
55
60
65
70
75
30 35 40 45 50 55 60 65 70 75 80
100 LFM
200 LFM
300 LFM
400 LFM
HPH-3.3/70-D48 Maximum Current Temperature Derating
(VIN=48V, Airflow is from VIN to VOUT, no baseplate)
Ambient Temperature (ºC)
Output Current (Amps)
VIN = 75 V
VIN = 50 V
VIN = 36 V
76
78
80
82
84
86
88
90
92
94
10 20 30 40 50 60 70
HPH-3.3/70-D48
Efficiency and Power Dissipation Vs. Load Current @ +25ºC
Efficiency (%)
Load Current (Amps)
0
10
20
30
40
50
60
70
80
30 35 40 45 50 55 60 65 70 75 80
100 LFM
200 LFM
300 LFM
400 LFM
HPH-3.3/70-D48 Maximum Current Temperature Derating
(VIN=48V, Airflow is from VIN to VOUT, with baseplate)
Ambient Temperature (ºC)
Output Current (Amps)
HPH Series
Isolated, Low VOUT to 70A, Half-Brick DC/DC Converters
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. © 2010 Murata Power Solutions, Inc.
www.murata-ps.com/locations email: sales@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
17 Sep 2010 MDC_HPH_A18 Page 13 of 13
Typical Performance Curves, Continued
70
75
80
85
90
95
100
3 6 9 12151821242730
0
8
16
24
32
40
48
HPH-12/30-D48
Efficiency and Power Dissipation Vs. Line Voltage and Load Current @ +25ºC
Efficiency (%)
Load Current (Amps)
VIN = 75V
VIN = 48V
VIN = 36V
Loss (Watts)
Power Dissipation @ Vin = 48V
0
5
10
15
20
25
30
35
30 35 40 45 50 55 60 65 70 75 80 85
Ambient Temperature (ºC)
Output Current (Amps)
HPH-12/30-D48 Maximum Current Temperature Derating at Sea Level
(Vin = 48V, Airflow is from input to output, baseplate is installed)
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
