HPH-12/30-D48NL1-C - Murata Power Solutions

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 1 of 13

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For full details go to

www.murata-ps.com/rohs

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.

The module will provide a 12Vdc output at

30Amps and accept a wide range input voltage of

36-75Vdc. The HPH topology offers high efﬁ ciency

up to 93%, tight line and load regulation, low ripple/

noise, and a fast dynamic load response. A single-

board, 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.

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

 12Vout @ 30A (360W)

 Industry Standard “Half Brick” package

 High Efﬁ ciency: up to 93%

 Outstanding thermal performance

 Optional Baseplate for conduction cooled

applications

 No output reverse conduction

 Input to Output Isolation, 2250Vdc (Basic)

 Input under-voltage lockout

 On/Off Control (Positive or Negative Logic)

 Output over-voltage protection

 Thermal shutdown

 Output short circuit protection (hiccup

technique)

Figure 1. Simpliﬁ ed Schematic

ypical u

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 2 of 13

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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.

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE

Root Model 

Output Input

Efficiency Package

(Case/

Pinout)

VOUT

(Volts)

➁

IOUT

(Amps,

Max.) ➁

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-12/30-D48 12 30 360 100 200 ±0.05% ±0.1% 48 36-75 150 8.1 92% 93% 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 speciﬁ cations are at nominal line voltage and full load, +25ºC. unless otherwise noted. See detailed speciﬁ cations.

 Full power continuous output requires baseplate installation. Please refer to the derating curves.

Nominal Output Voltage

HPH 30-/D48

Maximum Output Current

in Amps

High-Power Half

Brick 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)*

-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

On/Off Control Polarity

N = Negative polarity, standard

P = Positive polarity, optional

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.

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 3 of 13

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FUNCTIONAL SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS Conditions ➀Minimum Typical/Nominal Maximum Units

Input Voltage, Continuous Full power operation 0 75 Vdc

Ambient temperature range -40 85 Vdc

Input Voltage, Transient Operating or non-operating, tested:

100 mS max. duration 0 100 Vdc

Isolation Voltage Input to output tested 100 mS

IEC/EN/UL 60950-1, 2nd Edition 2250 Vdc

Input Reverse Polarity None, install external fuse None Vdc

On/Off Remote Control Power on or off, referred to -Vin 0 50 Vdc

Output Power 0 450 W

Output Current Current-limited, no damage,

short-circuit protected 030A

Storage Temperature Range Vin = Zero (no power) -55 125 ˚C

Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those

listed in the Performance/Functional Speciﬁ cations Table is not implied nor recommended.

INPUT

Operating voltage range ➁36 48 75 Vdc

Turn On/Start-up threshold Rising input voltage 33 34 35 Vdc

Turn Off/Undervoltage lockout Falling input voltage 31 32 33 Vdc

Reverse Polarity Protection None, install external fuse None Vdc

Recommended External Fuse Fast blow 20 A

Internal Filter Type Pi

Input current

Full Load Conditions Vin = nominal 8.06 8.23 A

Low Line Vin = minimum 10.75 10.98 A

Inrush Transient 0.3 A2-Sec.

Output in Short Circuit 50 100 mA

No Load Iout = minimum, unit=ON 150 200 mA

Standby Mode (Off, UV, OT) 45mA

Reﬂ ected (back) ripple current ➂Measured at input with speciﬁ ed ﬁ lter 60 100 mA, RMS

GENERAL and SAFETY

Efﬁ ciency Vin=48V, full load 92 93 %

Vin=36V, full load 92 93 %

Isolation

Isolation Voltage: no baseplate Input to output, continuous 2250 Vdc

Isolation Voltage: with baseplate

Input to output, continuous TBD Vdc

Input to Baseplate, continuous 1500

Output to Baseplate, continuous 1500

Insulation Safety Rating basic

Isolation Resistance 100 Mohm

Isolation Capacitance 2,000 pF

Safety (Designed to meet the following

requirements)

UL-60950-1, CSA-C22.2 No.60950-1,

IEC/EN60950-1, 2nd Edition Yes

Calculated MTBF

Per MIL-HDBK-217F

Ground benign, Tambient=+30˚C TBD Hours x 106

Per Telcordia SR332, issue 1 class 3, ground

ﬁ xed, Tambient=+40˚C 1.4 Hours x 106

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency 350 400 450 KHz

Startup Time Power On to Vout regulated 10-90%

(50% resistive load) 20 mS

Startup Time Remote ON to 10% Vout (50% resistive load) 20 mS

Dynamic Load Response 50-75-50% load step, settling time to within

±1% of Vout di/dt = 1 A/µSec 200 400 µSec

Dynamic Load Peak Deviation same as above ±400 mV

FEATURES and OPTIONS

Remote On/Off Control ➃

“N” sufﬁ x:

Negative Logic, ON state ON = Pin grounded or external voltage 0 0.8 V

Negative Logic, OFF state OFF = Pin open or external voltage 3.5 13.5 V

Control Current open collector/drain 1 2 mA

“P” sufﬁ x:

Positive Logic, ON state ON = Pin open or external voltage 3.5 13.5 V

Positive Logic, OFF state OFF = Pin grounded or external voltage 0 1 V

Control Current open collector/drain 1 2 mA

Base Plate “B” sufﬁ x

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 4 of 13

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Notes

➀ Unless otherwise noted, all speciﬁ cations are at nominal input voltage, nominal output voltage

and full load. General conditions are +25˚ Celsius ambient temperature, near sea level altitude,

natural convection airﬂ ow. All models are tested and speciﬁ ed with external parallel 1 µF and 10 µF

multi-layer ceramic output capacitors. No external input 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

➂ Input (back) ripple current is tested and speciﬁ ed over 5 Hz to 20 MHz bandwidth. Input ﬁ ltering 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 speciﬁ cations 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.

OUTPUT

Total Output Power See Derating 0.0 360 W

Voltage

Nominal Output Voltage No trim 11.88 12.00 12.12 Vdc

Setting Accuracy At 50% load -1 1 % of Vnom.

Output Voltage Range User-adjustable [6] -10 10 % of Vnom.

Overvoltage Protection Via magnetic feedback 14.5 Vdc

Current

Output Current Range 030A

Minimum Load No minimum load

Current Limit Inception ➄98% of Vnom., after warmup 31.5 37 44 A

Short Circuit

Short Circuit Current Hiccup technique, autorecovery within ±1% of

Vout, non-latching 6.6 A

Short Circuit Duration

(remove short for recovery) Output shorted to ground, no damage Continuous

Short circuit protection method Current limiting

Regulation ➅

Line Regulation Vin=min. to max. Vout=nom., 50% load ±0.05 %

Load Regulation Iout=min. to max. Vin=48V. ±0.1 %

Ripple and Noise ➆5 Hz- 20 MHz BW 100 200 mV pk-pk

Temperature Coefﬁ cient At all outputs 0.02 % of Vnom./°C

Maximum Capacitive Loading

(10% ceramic, 90% Oscon) Cap. ESR=<0.02, Full resistive load 0 10,000 F

MECHANICAL (Through Hole Models)

Outline Dimensions (no baseplate) Cxx case 2.3 X 2.4 X 0.4 Inches

WxLxH (Please refer to outline drawing) 58.4 X 60.96 X 10.2 mm

Outline Dimensions (with baseplate) 2.3 X 2.4 X 0.5 Inches

36.8x58.4x12.7 mm

Weight (no baseplate) TBD Ounces

TBD Grams

Weight (with baseplate) Ounces

Grams

Through Hole Pin Diameter Inches

Through Hole Pin Material Copper alloy

TH Pin Plating Metal and Thickness Nickel subplate µ-inches

Gold overplate µ-inches

Case or Baseplate Material Aluminum

ENVIRONMENTAL

Operating Ambient Temperature Range With derating, full power, natural convection,

no baseplate -40 85 ˚C

Operating Ambient Temperature Range with

Baseplate No derating, with baseplate, full power -40 120 ˚C

Storage Temperature Vin = Zero (no power) -55 125 ˚C

Thermal Protection/Shutdown Measured at hotspot 120 ˚C

Electromagnetic Interference

Conducted, EN55022/CISPR22 External ﬁ lter required B Class

Radiated, EN55022/CISPR22 B Class

Relative humidity, non-condensing To +85°C 10 90 %RH

Altitude -500 10,000 feet

(must derate -1%/1000 feet) -152 3048 meters

RoHS rating RoHS-6 or RoHS-5

(specify)

FUNCTIONAL SPECIFICATIONS (CONT.)

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 5 of 13

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TYPICAL PERFORMANCE DATA

Transient Response (Load 50% to 75%) Transient Response (Load 50% to 100%)

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)

Stepload Transient Response

On/Off Enable Start-up

Ripple and Noise

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 6 of 13

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TYPICAL PERFORMANCE DATA

Efﬁ ciency vs Line Voltage and Load Current @ +25°C

Maximum Current Temperature Derating vs. Airﬂ ow

(Vin=48V., airﬂ ow direction is from –Vin to +Vin, with baseplate)

Maximum Current Temperature Derating vs. Airﬂ ow

(Vin=48V., airﬂ ow direction is from –Vin to +Vin, no baseplate)

Maximum Current Temperature Derating vs. Airﬂ ow

(Vin=48V., airﬂ ow direction is from Vin to Vout, with baseplate)

3 6 9 12151821242730

= 36V

= 48 V

= 75 V

Efﬁciency (%)

Load Current (Amps)

30 35 40 45 50 55 60 65 70 75 80 85

Natural Convection

100 LFM

200 LFM

300 LFM

400 LFM

Output Current (Amps)

Ambient Temperature

(°C)

30 35 40 45 50 55 60 65 70 75 80 85

Natural Convection

100 LFM

200 LFM

300 LFM

400 LFM

Output Current (Amps)

Ambient Temperature

(°C)

30 35 40 45 50 55 60 65 70 75 80 85

Natural Convection

100 LFM

200 LFM

300 LFM

400 LFM

Output Current (Amps)

Ambient Temperature

(°C)

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 7 of 13

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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.

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 Not Available

3 On/Off Control

4 Positive Input

5 Positive Output

6 Positive Sense

7 Trim

8 Negative Sense

9 Negative Output

Bottom View

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

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 8 of 13

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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 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

Shutdown whose voltage decays as input current is consumed (such as capac-

itor 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 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

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. 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 reason-

able input voltage regulation. Since real-world voltage sources have ﬁ nite

TECHNICAL NOTES impedance, 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 frequen-

cies), 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.

BUS

= 33µF, ESR < 700mΩ @ 100kHz

BUS

= 220µF, ESR < 100mΩ @ 100kHz

BUS

= 12µH

+VIN

–

VIN

CURRENT

PROBE

OSCILLOSCOPE

–

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 ﬁ lter elements

such as multiple external capacitors. Be sure to calculate component tem-

perature rise from reﬂ ected AC current dissipated inside capacitor ESR. Our

Application Engineers can recommend potential solutions.

In ﬁ gure 3, the two copper strips simulate real-world printed circuit imped-

ances 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-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 9 of 13

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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 applica-

tion 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 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

convection”, 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 understand 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 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 some-

what constant power output. This is commonly referred to as power limiting.

Current limiting inception is deﬁ ned as the point at which full power falls

below the rated tolerance. See the Performance/Functional Speciﬁ cations. Note

particularly that the output current may brieﬂ y rise above its rated value. 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

Figure 3. Measuring Output Ripple and Noise (PARD)

C1 = 0.1µF CERAMIC

C2 = 10µF TANTALUM

LOAD 2-3 INCHES (51-76mm) FROM MODULE

C2 R

LOAD

COPPER STRIP

SCOPE

+OUTPUT

+SENSE

-SENSE

-OUTPUT

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 10 of 13

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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 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 4. 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

output current and the highest output voltage. Therefore the designer must insure:

(Vout at pins) x (Iout) ≤ (Max. rated output power)

Trimming the Output Voltage

The Trim input to the converter allows the user to adjust the output voltage

over the rated trim range (please refer to the Speciﬁ cations). In the trim equa-

tions and circuit diagrams that follow, trim adjustments use either a trimpot or

LOAD

Contact and PCB resistance

losses due to IR drops

Contact and PCB resistance

losses due to IR drops

+VOUT

+SENSE

TRIM

–SENSE

–VOUT

+VIN

ON/OFF

CONTROL

–VIN

Sense Current

IOUT

Sense Return

IOUT Return Figure 5. Trim adjustments using a trimpot

LOAD

75-22

TURNS

+VOUT

+SENSE

TRIM

–SENSE

–VOUT

+VIN

ON/OFF

CONTROL

–VIN

Figure 6. Trim adjustments to Increase Output Voltage using a Fixed Resistor

LOAD

RTRIM UP

+VOUT

+SENSE

TRIM

–SENSE

–VOUT

+VIN

ON/OFF

CONTROL

–VIN

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 11 of 13

www.murata-ps.com/support

Trim Equations

Where Vref = +1.225 Volts and ∆ is the desired output voltage change. Note

that "∆" 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 disable 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 7. Trim adjustments to Decrease Output Voltage using a Fixed Resistor

Figure 8. Driving the Positive Polarity On/Off Control Pin

Figure 9. Driving the Negative Polarity On/Off Control Pin

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 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.

+VOUT

+SENSE

TRIM

–SENSE

–VOUT

+VIN

ON/OFF

CONTROL

–VIN

LOAD

RTRIM DOWN

ON/OFF

CONTROL

–VIN

+VIN +VCC

Radj_up (in kΩ) = - - 2

Vnominal x (1+∆) 1

∆

1.225 x ∆

where ∆ = Vnominal -Vout

Vnominal

Radj_down (in kΩ) = - 2

∆

where ∆ = Vout -Vnominal

Vnominal

ON/OFF CONTROL

CONTROL

+ Vcc

–

VIN

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

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-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 12 of 13

www.murata-ps.com/support

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

Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153

2Line V-networks LS1-15V 50/50Uh Line Impedance Stabilization Network

[3] Conducted Emissions Test Results

[4] Layout Recommendations

Most applications can use the ﬁ ltering which is already installed inside the

converter or with the addition of the recommended external capacitors. For

greater emissions suppression, consider additional ﬁ lter components and/or

shielding. Emissions performance will depend on the user’s PC board layout,

the chassis shielding environment and choice of external components. Please

refer to Application Note 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.

Reference Part Number Description Vendor

C1, C2, C3, C4, C5 GRM32ER72A105KA01L SMD CERAMIC-100V-

1000nF-X7R-1210 Murata

C6 GRM319R72A104KA01D SMD CERAMIC 100V-100nF-

±10%-X7R-1206 Murata

L1, L2 PG0060T COMMON MODE-473uH-

±25%-14A Pulse

C8, C9, C10, C11 GRM55DR72J224KW01L SMD CERAMIC630V-0.22µF-

±10%-X7R-2220 Murata

C7 UHE2A221MHD Aluminum100V-220µf-

±10%-long lead Nichicon

C12 NA

LOAD

C2 L1

C6 C7 DC/DC C12

VCC

RTN

-48V

GND

C3C1 L2

C5C4

C8 C9 C10 C11

Figure 10. Conducted Emissions Test Circuit

Graph 1. Conducted emissions performance, Positive Line,

CISPR 22, Class B, full load at 48Vin

Graph 2. Conducted emissions performance, Negative Line,

CISPR 22, Class B, full load at 48Vin

HPH-12/30-D48 Series

Isolated, 12 VOUT, 30A, Half-Brick DC/DC Converters

MDC_HPH-12/30-D48.A06 Page 13 of 13

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

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/

IR Video

Camera

IR Transparent

optical window Variable

speed fan

Heating

element

Ambient

temperature

sensor

Airﬂow

collimator

Precision

low-rate

anemometer

3” below UUT

Unit under

test (UUT)

Vertical Wind Tunnel

Murata Power Solutions employs a custom-designed

enclosed vertical wind tunnel, infrared video camera system

and test instrumentation for accurate airﬂ ow and heat dis-

sipation 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

transparent 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 sol-

dered down to a host carrier board for realistic heat absorption

and spreading. Both longitudinal and transverse airﬂ ow stud-

ies 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 ele-

ment to make uniform temperature distribution. The collimator

also reduces the amount of turbulence adjacent to the UUT

by restoring 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