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LAST TIME BUY: AUGUST 31, 2014. CLICK HERE FOR OBSOLESCENCE NOTICE OF FEBRUARY 2014.
HPH-12/30-D48 Series
www.murata-ps.com
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
Typical uni
unit
FEATURES
PRODUCT OVERVIEW

12Vout @ 30A (360W)
For applications requiring improved electrical and
thermal performance, consider Murata’s new HPH
series “Half Brick” DC/DC power converters. These
compact modules measure 2.4" X 2.3" X 0.4" (61
X 58 X 10.2mm) and offer the industry-standard
Half Brick footprint.

Industry Standard “Half Brick” package

High Efficiency: up to 93%

Outstanding thermal performance

Optional Baseplate for conduction cooled
applications

No output reverse conduction

Input to Output Isolation, 2250Vdc (Basic)
up to 93%, tight line and load regulation, low ripple/
noise, and a fast dynamic load response. A singleboard, highly optimized thermal design contributes
to the superior thermal performance.
These DC/DC’s provide output trim, sense pins,
and primary side on/off control. Standard features
also include input under-voltage shutdown, output
over-voltage protection, output short-circuit/current
limiting protection, and thermal shutdown.
The module will provide a 12Vdc output at
30Amps and accept a wide range input voltage of
36-75Vdc. The HPH topology offers high efficiency

Input under-voltage lockout

On/Off Control (Positive or Negative Logic)

Output over-voltage protection

Thermal shutdown

Output short circuit protection (hiccup
technique)
+SENSE
(6)
+Vin
(4)
+Vout
(5)
SWITCH
CONTROL
–Vout
(9)
–Vin
(1)
PULSE
TRANSFORMER
PWM
CONTROLLER
REMOTE
ON /OFF
CONTROL*
(3)
REFERENCE &
ERROR AMP
–SENSE
(8)
Vout
TRIM
(7)
Typical topology is shown. Some models may vary slightly.
For full details go to
www.murata-ps.com/rohs
OPTO
ISOLATION
Input undervoltage, input
overvoltage, and output
overvoltage comparators
* Can be ordered with positive (standard) or negative (optional) polarity.
Figure 1. Simplified Schematic
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MDC_HPH-12/30-D48.B01 Page 1 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Input
Root Model 
VOUT
(Volts)
➁
IOUT
(Amps,
Max.) ➁
(Watts)
Typ.
Max.
Line
HPH-12/30-D48
12
30
360
100
200
±0.05%




Power
R/N (mV pk-pk)
Efficiency
Load
VIN Nom.
(Volts)
Range
(Volts)
IIN, no
load
(mA)
IIN, full
load
(Amps)
Min.
Typ.
±0.1%
48
36-75
150
8.1
92%
93%
Regulation (Max.)
Package
(Case/
Pinout)
C61
P17
Please refer to the full model number structure for additional ordering part numbers and options.
Please refer to maximum input/output voltage graph.
All specifications are at nominal line voltage and full load, +25ºC. unless otherwise noted. See detailed specifications.
Full power continuous output requires baseplate installation. Please refer to the derating curves.
* LAST TIME BUY: AUGUST 31, 2014. CLICK HERE FOR OBSOLESCENCE NOTICE OF FEBRUARY 2014.
As of September 2014, ONLY the following part numbers will be available: HPH-12/30-D48N-C; HPH-12/30-D48NB-C
PART NUMBER STRUCTURE
HPH - 12 / 30 - D48 N B
High-Power Half
Brick Series
Nominal Output Voltage
Maximum Output Current
in Amps
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
On/Off Control Polarity
N = Negative polarity, standard
P = Positive polarity, optional
H Lx - 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
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)*
Conformal coating (optional)
Blank = no coating, standard
H = Coating added, optional, special quantity order
Baseplate (optional)
Blank = No baseplate, standard
B = Baseplate installed, optional quantity order
*Special quantity order is
required; samples available
with standard pin length only.
Note:
Some model number combinations
may not be available. See website
or contact your local Murata sales
representative.
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 sufficient, install additional discrete wiring.
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MDC_HPH-12/30-D48.B01 Page 2 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Output Power
Conditions ➀
Minimum
Maximum
Units
Full power operation
Ambient temperature range
Operating or non-operating, tested:
100 mS max. duration
Input to output tested 100 mS
IEC/EN/UL 60950-1, 2nd Edition
None, install external fuse
Power on or off, referred to -Vin
0
-40
75
85
Vdc
Vdc
0
100
Vdc
2250
Vdc
50
450
Vdc
Vdc
W
Typical/Nominal
None
0
0
Current-limited, no damage,
0
30
A
short-circuit protected
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 Specifications Table is not implied nor recommended.
Output Current
INPUT
Operating voltage range ➁
Turn On/Start-up threshold
Turn Off/Undervoltage lockout
Reverse Polarity Protection
Recommended External Fuse
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Standby Mode (Off, UV, OT)
Reflected (back) ripple current ➂
Rising input voltage
Falling input voltage
None, install external fuse
Fast blow
36
33
31
Vin = nominal
Vin = minimum
Iout = minimum, unit=ON
Measured at input with specified filter
48
34
32
None
20
Pi
75
35
33
Vdc
Vdc
Vdc
Vdc
A
8.06
10.75
0.3
50
150
4
60
8.23
10.98
A
A
A2-Sec.
mA
mA
mA
mA, RMS
100
200
5
100
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage: no baseplate
Isolation Voltage: with baseplate
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety (Designed to meet the following
requirements)
Calculated MTBF
Vin=48V, full load
Vin=36V, full load
92
92
Input to output, continuous
Input to output, continuous
Input to Baseplate, continuous
Output to Baseplate, continuous
2250
TBD
1500
1500
93
93
%
%
Vdc
Vdc
basic
100
2,000
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Per MIL-HDBK-217F
Ground benign, Tambient=+30˚C
Per Telcordia SR332, issue 1 class 3, ground
fixed, Tambient=+40˚C
Mohm
pF
Yes
TBD
Hours x 106
1.4
Hours x 106
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
350
Power On to Vout regulated 10-90%
(50% resistive load)
Remote ON to 10% Vout (50% resistive load)
50-75-50% load step, settling time to within
±1% of Vout di/dt = 1 A/μSec
same as above
400
200
450
KHz
20
mS
20
mS
400
μSec
±400
mV
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Base Plate
ON = Pin grounded or external voltage
OFF = Pin open or external voltage
open collector/drain
0
3.5
ON = Pin open or external voltage
OFF = Pin grounded or external voltage
open collector/drain
“B” suffix
3.5
0
1
0.8
13.5
2
V
V
mA
1
13.5
1
2
V
V
mA
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MDC_HPH-12/30-D48.B01 Page 3 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
FUNCTIONAL SPECIFICATIONS (CONT.)
OUTPUT
Total Output Power
Voltage
Nominal Output Voltage
Setting Accuracy
Output Voltage Range
Overvoltage Protection
Current
Output Current Range
Minimum Load
Current Limit Inception ➄
Short Circuit
Short Circuit Current
Short Circuit Duration
(remove short for recovery)
Short circuit protection method
Regulation ➅
Line Regulation
Load Regulation
Ripple and Noise ➆
Temperature Coefficient
Maximum Capacitive Loading
(10% ceramic, 90% Oscon)
See Derating
0.0
No trim
At 50% load
User-adjustable [6]
Via magnetic feedback
11.88
-1
-10
12.00
W
12.12
1
10
Vdc
% of Vnom.
% of Vnom.
Vdc
30
A
44
A
14.5
0
98% of Vnom., after warmup
360
31.5
No minimum load
37
Hiccup technique, autorecovery within ±1% of
Vout, non-latching
6.6
Output shorted to ground, no damage
Continuous
A
Current limiting
Vin=min. to max. Vout=nom., 50% load
Iout=min. to max. Vin=48V.
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=<0.02Ω, Full resistive load
100
0.02
0
±0.05
±0.1
200
%
%
mV pk-pk
% of Vnom./°C
10,000
μF
MECHANICAL (Through Hole Models)
Outline Dimensions (no baseplate)
Cxx case
WxLxH (Please refer to outline drawing)
2.3 X 2.4 X 0.4
58.4 X 60.96 X 10.2
2.3 X 2.4 X 0.5
36.8x58.4x12.7
TBD
TBD
Outline Dimensions (with baseplate)
Weight (no baseplate)
Inches
mm
Inches
mm
Ounces
Grams
Ounces
Grams
Inches
mm
Weight (with baseplate)
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Copper alloy
Nickel subplate
Gold overplate
μ-inches
μ-inches
Case or Baseplate Material
Aluminum
ENVIRONMENTAL
Operating Ambient Temperature Range
With derating, full power, natural convection,
no baseplate
-40
85
˚C
No derating, with baseplate, full power
-40
120
˚C
Vin = Zero (no power)
Measured at hotspot
-55
125
120
˚C
˚C
B
Class
Operating Ambient Temperature Range with
Baseplate
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
(must derate -1%/1000 feet)
External filter required
B
To +85°C
RoHS rating
Notes
➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage
and full load. General conditions are +25˚ Celsius ambient temperature, near sea level altitude,
natural convection airflow. All models are tested and specified with external parallel 1 µF and 10 µF
multi-layer ceramic output capacitors. No external input capacitors are installed. 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 application.
➁ The module will operate when input voltage is within the 36-75V Operating Voltage Range, Output
regulation at full load will be achieved only when Vin >= 39V
10
-500
-152
90
10,000
3048
Class
%RH
feet
meters
RoHS-6 or RoHS-5
(specify)
➂ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering is
Cbus = 0 µF, Cin = 100 µF and Lbus = < 4.7 µH.
➃ The Remote On/Off Control is referred to -Vin.
➄ Over-current protection is non-latching with auto reovery (Hiccup)
➅ Regulation specifications describe the output voltage changes as the line voltage or load current is
varied from its nominal or midpoint value to either extreme.
➆ Output Ripple & Noise is measured with 750 µF capacitance, 10% ceramic and 90% OSCON. 20
MHz bandwidth.
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MDC_HPH-12/30-D48.B01 Page 4 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Stepload Transient Response
Transient Response (Load 50% to 75%)
Transient Response (Load 50% to 100%)
On/Off Enable Start-up
Enable Start-up (Vin=48V Iout=30A)
Enable Start-up (Vin=48V Iout=0A)
Ripple and Noise Waveform (Vin=48V Iout=30A)
Ripple and Noise Waveform (Vin=48V Iout=0A)
Ripple and Noise
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MDC_HPH-12/30-D48.B01 Page 5 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
TYPICAL PERFORMANCE DATA
Efficiency vs Line Voltage and Load Current @ +25°C
Maximum Current Temperature Derating vs. Airflow
(Vin=48V., airflow direction is from –Vin to +Vin, no baseplate)
98
96
35
94
30
90
Output Current (Amps)
Efficiency (%)
92
VIN = 75 V
VIN = 48 V
VIN = 36V
88
86
84
25
20
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
15
10
82
5
80
0
30
78
3
6
9
12
15
18
21
Load Current (Amps)
24
27
35
35
30
30
25
25
20
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
10
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
80
85
Maximum Current Temperature Derating vs. Airflow
(Vin=48V., airflow direction is from Vin to Vout, with baseplate)
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating vs. Airflow
(Vin=48V., airflow direction is from –Vin to +Vin, with baseplate)
15
35
30
20
Natural Convection
100 LFM
200 LFM
300 LFM
400 LFM
15
10
5
5
0
0
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
80
85
30
35
40
45
50
55
60
65
Ambient Temperature (°C)
70
75
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MDC_HPH-12/30-D48.B01 Page 6 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
MECHANICAL SPECIFICATIONS
2.30
(58.4)
A
User’s thermal surface and hardware
Recommended threaded insert torque
is 0.35-0.55 N-M or 3-5 in-lbs.
0.40
(10.2)
Do not remove
M3 x 0.50
threaded inserts
from bottom PCB
Baseplate
0.50
(12.7)
0.015 min. clearance
between standoffs and
highest component
0.18
(4.57)
Pin Diameters:
Pins 1-4, 6-8
Pins 5, 9
1.900
(48.26)
A
0.040 ± 0.001 (1.016 ±0.025)
0.080 ± 0.001 (2.032 ±0.025)
0.015 minimum
clearance between
standoffs and
highest component
0.18
(4.6)
0.20
(5.1)
2.30 (58.4)
1.90 (48.3)
B
1
9
2
M3 x 0.50
threaded insert
and standoff (4 places)
8
Case C61
7
3
6
0.400
(10.16)
4
0.700
(17.78)
1.000
(25.40)
1.400
(35.56)
2.40
(60.96)
Screw length must
not go through Baseplate
2.00
(50.8)
2.40
(61.0)
5
0.50
(12.70)
Bottom View
HPH with Optional Baseplate
B
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
INPUT/OUTPUT CONNECTIONS
Pin
Function P17
1
Negative Input
2
Not Available
3
On/Off Control
4
Positive Input
5
Positive Output
6
Positive Sense
7
Trim
8
Negative Sense
9
Negative Output
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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.
The Trim connection may be left open and the converter will achieve its rated output voltage.
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MDC_HPH-12/30-D48.B01 Page 7 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
TECHNICAL NOTES
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, i.e. IEC/EN/UL 60950-1.
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 permanent 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 Specifications). 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 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.
impedance, performance is improved by adding external filter components.
Sometimes only a small ceramic capacitor is sufficient. Since it is difficult 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 specifies 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 specified for input reflected
ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. External input capacitors
(Cin in the figure) 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 figure below, the Cbus
and Lbus components simulate a typical DC voltage bus. Your specific system
configuration may require additional considerations. Please note that the values
of Cin, Lbus and Cbus will vary according to the specific converter model.
TO
OSCILLOSCOPE
+VIN
VIN
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to Vout
Start-Up Time (see Specifications) 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 specified accuracy band.
Actual measured times will vary with input source impedance, external input
capacitance, input voltage slew rate and final 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
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 specified accuracy
band. The specification assumes that the output is fully loaded at maximum
rated current. Similar conditions apply to the On to Vout regulated specification
such as external load capacitance and soft start circuitry.
Input Source Impedance
These converters will operate to specifications without external components,
assuming that the source voltage has very low impedance and reasonable input voltage regulation. Since real-world voltage sources have finite
CURRENT
PROBE
+
–
+
–
LBUS
CBUS
CIN
–VIN
CIN = 33μF, ESR < 700mΩ @ 100kHz
CBUS = 220μF, ESR < 100mΩ @ 100kHz
LBUS = 12μH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple and noise (also referred to as periodic
and random deviations or PARD) may be reduced by adding filter elements
such as multiple external capacitors. Be sure to calculate component temperature rise from reflected AC current dissipated inside capacitor ESR. Our
Application Engineers can recommend potential solutions.
In figure 3, the two copper strips simulate real-world printed circuit impedances 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 fixture.
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MDC_HPH-12/30-D48.B01 Page 8 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
+SENSE
+OUTPUT
6
COPPER STRIP
5
C1
-OUTPUT
-SENSE
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside air.
Also note that very low flow rates (below about 25 LFM) are similar to “natural
convection”, that is, not using fan-forced airflow.
C2
SCOPE
RLOAD
9
8
COPPER STRIP
C1 = 0.1μF CERAMIC
C2 = 10μF TANTALUM
LOAD 2-3 INCHES (51-76mm) FROM MODULE
Figure 3. Measuring Output Ripple and Noise (PARD)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are “floating” 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 Specifications).
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 specifications. 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 rectifier design topology. All models
regulate within specification 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 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 Specifications.
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 this data sheetillustrate 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 airflow 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 airflow as long as the average is not exceeded.
MPS makes Characterization measurements in a closed cycle wind
tunnel with calibrated airflow. We use both thermocouples and an infrared
camera system to observe thermal performance. As a practical matter, it is
quite difficult to insert an anemometer to precisely measure airflow in most
applications. Sometimes it is possible to estimate the effective airflow if you
thoroughly understand the enclosure geometry, entry/exit orifice areas and the
fan flowrate specifications. 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 primary 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 voltage 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 protection. 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 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 commonly referred to as power limiting.
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifications. Note
particularly that the output current may briefly 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,
the PWM will restart, causing the output voltage to begin ramping up to its
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MDC_HPH-12/30-D48.B01 Page 9 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
appropriate 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 indefinitely.
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 moderate 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.
a single fixed 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 coefficient (±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 specified 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 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. Also consider adding a small value ceramic
capacitor between the Trim and –Vout to bypass RF and electrical noise.
Please observe Sense inputs tolerance to avoid improper operation:
[Vout(+) –Vout(-)] – [ Sense(+) – Sense(-)] ≤ 10% of Vout
+VOUT
+VIN
+SENSE
Contact and PCB resistance
losses due to IR drops
+VIN
+VOUT
ON/OFF
CONTROL
I OUT
TRIM
7 5-22
TURNS
LOAD
+SENSE
Sense Current
ON/OFF
CONTROL
TRIM
–SENSE
LOAD
Sense Return
–VIN
–VOUT
–SENSE
I OUT Return
–VIN
Figure 5. Trim adjustments using a trimpot
–VOUT
Contact and PCB resistance
losses due to IR drops
Figure 4. Remote Sense Circuit Configuration
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 protection circuit to activate and shut down the output.
+VOUT
+VIN
+SENSE
ON/OFF
CONTROL
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 Specifications). In the trim equations and circuit diagrams that follow, trim adjustments use either a trimpot or
TRIM
LOAD
R TRIM UP
–SENSE
–VIN
–VOUT
Figure 6. Trim adjustments to Increase Output Voltage using a Fixed Resistor
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MDC_HPH-12/30-D48.B01 Page 10 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
Negative: Optional negative-polarity devices are on (enabled) when the On/
Off is grounded or brought to within a low voltage (see Specifications) with
respect to –Vin. The device is off (disabled) when the On/Off is pulled high to
+Vin with respect to –Vin.
+VOUT
+VIN
+SENSE
ON/OFF
CONTROL
TRIM
LOAD
+VIN
R TRIM DOWN
+VCC
–SENSE
–VIN
ON/OFF
CONTROL
–VOUT
Figure 7. Trim adjustments to Decrease Output Voltage using a Fixed Resistor
Radj_up (in kΩ) = Vnominal x (1+Δ) - 1 - 2
1.225 x Δ
Δ
where Δ =
Figure 9. Driving the Negative Polarity On/Off Control Pin
Vout -Vnominal
Vnominal
Dynamic control of the On/Off function should be able to sink appropriate
signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a finite time in milliseconds (see
Specifications) 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.
1
-2
Δ
Vnominal -Vout
Vnominal
Radj_down (in kΩ) =
where Δ =
–VIN
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.
There are two CAUTIONs for the On/Off Control:
A single resistor connected between Trim and +Sense will increase the output
voltage. A resistor connected between Trim and –Sense will decrease the output.
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).
Remote On/Off Control
On the input side, a remote On/Off Control can be ordered with either polarity.
CAUTION: Do not apply voltages to the On/Off pin when there is no input
power voltage. Otherwise the converter may be permanently damaged.
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 Specifications). Positive-polarity devices are disable when the
On/Off is grounded or brought to within a low voltage (see Specifications) with
respect to –Vin.
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications 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:
+ Vcc
ON/OFF CONTROL
CONTROL
Maximum Preheat Temperature
For Sn/Pb based solders:
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
–VIN
Figure 8. Driving the Positive Polarity On/Off Control Pin
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MDC_HPH-12/30-D48.B01 Page 11 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
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.
[3] Conducted Emissions Test Results
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 Specifications. An external discrete filter is
installed and the circuit diagram is shown below.
VCC
RTN
C1 C2
C3
L1
L2
C4 C5
+
C6 C7
+
C12
DC/DC
LOAD
-48V
C8
C9
C10
GND
C11
GND
Figure 10. Conducted Emissions Test Circuit
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, full load at 48Vin
[1] Conducted Emissions Parts List
Reference
C1, C2, C3, C4, C5
C6
L1, L2
C8, C9, C10, C11
C7
C12
Part Number
Description
Vendor
SMD CERAMIC-100VGRM32ER72A105KA01L
Murata
1000nF-X7R-1210
SMD CERAMIC 100V-100nFGRM319R72A104KA01D
Murata
±10%-X7R-1206
COMMON MODE-473uHPG0060T
Pulse
±25%-14A
SMD CERAMIC630V-0.22μFGRM55DR72J224KW01L
Murata
±10%-X7R-2220
Aluminum100V-220μfUHE2A221MHD
Nichicon
±10%-long lead
NA
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, full load at 48Vin
[4] Layout Recommendations
Most applications can use the filtering which is already installed inside the
converter or with the addition of the recommended external capacitors. For
greater emissions suppression, consider additional filter 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 GEAN-02 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.
www.murata-ps.com/support
MDC_HPH-12/30-D48.B01 Page 12 of 13
HPH-12/30-D48 Series
Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters
Vertical Wind Tunnel
IR Transparent
optical window
Unit under
test (UUT)
Variable
speed fan
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
transparent to infrared wavelengths. The computer files from
the IR camera can be studied for later analysis.
IR Video
Camera
Heating
element
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Airflow
collimator
Figure 11. Vertical Wind Tunnel
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions employs a custom-designed
enclosed vertical wind tunnel, infrared video camera system
and test instrumentation for accurate airflow and heat dissipation analysis of power products. The system includes
a precision low flow-rate anemometer, variable speed fan,
power supply input and load controls, temperature gauges and
adjustable heating element.
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 airflow studies are possible by rotation of this carrier board since there are
often significant differences in the heat dissipation in the two
airflow directions. The combination of both adjustable airflow,
adjustable ambient heat and adjustable Input/Output currents
and voltages mean that a very wide range of measurement
conditions can be studied.
The airflow 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 restoring laminar airflow. 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.
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/
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. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_HPH-12/30-D48.B01 Page 13 of 13
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