Datasheet

ManualsBrandsMURATA POWER SOLUTIONS ManualsPSU ComponentsDC/DC converter (print) 28 V 12.5 A 350 W No. of outputs: 1 x

PAH-28 Vout, 350-Watt Series

Isolated, 350-Watt, Half-Brick DC-DC Converters

MDC_PAH-28Vout-350W.B05 Page 1 of 21

www.murata-ps.com

www.murata-ps.com/support

For full details go to

www.murata-ps.com/rohs

For applications requiring improved electrical and

thermal performance, consider Murata’s new PAH

series “Half Brick” DC-DC power converters. These

compact modules measure 2.3" X 2.4" X 0.5" (58

X 61 X 12.7mm) and offer the industry-standard

Half Brick footprint.

The PAH Series is ideal for power ampliﬁ er

applications, wireless networks, and telecom

applications. The baseplate provides a means for

conduction cooling in demanding thermal environ-

ment conditions.

The module provides a 28Vdc output at 12.5 Amps

and accepts a wide input voltage range of 18-36 or

36-75 Vdc. The PAH 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 half-bricks provide output trim, sense

pins, and primary side on/off control. Standard fea-

tures also include input under-voltage shutdown,

output over-voltage protection, output short-circuit/

current limiting protection, and thermal shutdown.

PRODUCT OVERVIEW

Typical unit

Typical topology is shown. Some models may vary slightly.

FEATURES



28Vout @ 12.5A (350W)



Trimmable 16.8 Vout to 32.2 Vout @ 350W

with Vin = 18-36V (D24) or 36-75V (D48)



Industry Standard “Half Brick” package



High Efﬁ ciency: up to 93%



Outstanding thermal performance



Standard 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)



Certiﬁ ed to UL/EN 60950-1, CSA-C22.2 No.

60950-1, 2nd edition safety approvals

Figure 1. Simpliﬁ ed Schematic

Typical unit

External

Power

Source

Reference and

Error Ampliﬁer

-Vout

Cout

+Vout

Trim

On/Off

Control

-Vin

Open = On

+Vin

logic)

Controller

and Power

Barrier

Case ground

NOTE: A minimum of 470µF

of capacitance is required

on the output to ensure

stable operation. An ESR

equal to or less than 0.02

is also required.

Output (V) Current (A) Input Voltage (V)

28 12.5 18-36 or 36-75

Summary of content (21 pages)

PAGE 1
PAH-28 Vout, 350-Watt Series www.murata-ps.com Isolated, 350-Watt, Half-Brick DC-DC Converters Output (V) Current (A) Input Voltage (V) 28 12.5 18-36 or 36-75 Typical unit FEATURES PRODUCT OVERVIEW  28Vout @ 12.5A (350W) For applications requiring improved electrical and thermal performance, consider Murata’s new PAH series “Half Brick” DC-DC power converters. These compact modules measure 2.3" X 2.4" X 0.5" (58 X 61 X 12.7mm) and offer the industry-standard Half Brick footprint.
PAGE 2
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input Efficiency VOUT (Volts) IOUT (Amps, Max.) (Watts) Typ. Max. Line PAH-28/12.5-D24 28 12.5 350 75 200 PAH-28/12.5-D48 28 12.5 350 100 300 Root Model ➀ Power R/N (mV pk-pk) Load VIN Nom. (Volts) Range (Volts) IIN, no load (mA) IIN, full load (Amps) Min. ➃ Typ. Dimensions (inches) ±0.125% ±0.25% 24 18-36 80 15.7 91.5% 92.5% 2.
PAGE 3
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D24 ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Input Voltage, Transient Isolation Voltage On/Off Remote Control Output Power Conditions Minimum Typical/Nominal 0 100 mS max. duration Input to output Power on, referred to -Vin 0 0 Maximum Units 36 50 2250 13.5 357 Vdc Vdc Vdc Vdc W Current-limited, no damage, short-circuit 0 12.
PAGE 4
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D24 (CONT.
PAGE 5
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Efﬁciency and Power Dissipation 96 32 92 28 24 VIN = 36V VIN = 24V VIN = 18V 84 20 80 16 76 12 Power Dissipation VIN = 24V 72 Dissipation (Watts) Efﬁciency (%) 88 8 68 4 64 0.5 1.7 2.9 4.1 5.3 6.5 7.7 Iout (Amps) 8.9 10.1 11.3 0 12.5 www.murata-ps.com/support MDC_PAH-28Vout-350W.
PAGE 6
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Transverse Longitudinal Maximum Current Temperature Derating at sea level (Vin=18V, airﬂow from Vin to Vout, open frame) 14 14 12 12 10 10 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin=18V, airﬂow from Vin- to Vout+, open frame) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 8 6 4 2 0.
PAGE 7
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D24 Transverse Longitudinal Maximum Current Temperature Derating at sea level (Vin=18V, airﬂow from Vin to Vout, with baseplate) 14 14 12 12 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 10 8 Output Current (Amps) Output Current (Amps) Maximum Current Temperature Derating at sea level (Vin=18V, airﬂow from Vin- to Vout+, with baseplate) 6 4 2 0.
PAGE 8
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D48 ABSOLUTE MAXIMUM RATINGS Input Voltage, Continuous Input Voltage, Transient Isolation Voltage Input Reverse Polarity On/Off Remote Control Output Power Conditions ➀ Minimum Full power operation Operating or non-operating, tested: 100 mS max.
PAGE 9
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D48 (CONT.) OUTPUT Conditions Minimum Typical/Nominal Maximum Units Total Output Power Voltage Nominal Output Voltage Setting Accuracy Output Voltage Range Overvoltage Protection Current Output Current Range Minimum Load Current Limit Inception ➃ Short Circuit See Derating 0.0 350 355.25 W No trim At 50% load User-adjustable Via magnetic feedback 27.58 -1.5 16.8(-40%) 34 28 28.
PAGE 10
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 Efﬁciency and Power Dissipation, Ambient Temperature = +25°C Output Power Derating in Conduction Cooling (Cold Baseplate) Applications (Vin=48V, Ambient Temperature <70°C) 96 36 92 32 80 24 20 76 16 Power Dissipation VIN = 48V 72 12 68 8 64 4 60 1.25 2.5 3.75 5 6.25 7.5 Iout (Amps) 8.75 10 11.
PAGE 11
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 On/Off Enable Startup (Vin=48V, Vout=nom, Iout=12.5A, Cload=470μF, Ta=+25°C) Ch2=Vout, Ch4=Enable Startup Delay (Vin=48V, Vout=nom, Iout=12.5A, Cload=470μF, Ta=+25°C)Ch1=Vin, Ch2=Vout Output Ripple and Noise (Vin=48V, Vout=nom, Iout=0A, Cload=470μF, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=12.5A, Cload=470μF, Ta=+25°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.
PAGE 12
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters TYPICAL PERFORMANCE DATA, PAH-28/12.5-D48 Step Load Transient Response (Vin=48V, Vout=nom, Cload=470μF, Iout=75 % to 50% of full load, Ta=+25°C) Step Load Transient Response (Vin=48V, Vout=nom, Cload=470μF, Iout=50% to 75% of full load, Ta=+25°C) Step Load Transient Response (Vin=48V, Vout=nom, Cload=470μF, Iout=50-75-50% of full load, Ta=+25°C) www.murata-ps.com/support MDC_PAH-28Vout-350W.
PAGE 13
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters MECHANICAL SPECIFICATIONS 0.50 (12.7) 0.008 (0.20) Min 8 7 3 6 4 5 2.30 (58.42) SECTION A-A 0.010 (0.254) Min 0.50 (12.7) Bottom Pin Side View 0.335 (8.51) TYP 4PL 2 0.126 (3.2) THREADED TYP 4PL 9 1.400 (35.56) 1 0.600 (15.24) 2.40 (60.96) 1.400 (35.56) 0.600 (15.24) PIN STANDOFF IS LOWER THAN DIA 3.2mm THROUGH HOLE RIVET STANDOFF Dimensions are in inches (mm shown for ref. only). Third Angle Projection 1.900 (48.
PAGE 14
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters BASEPLATE WITH STANDARD M3-12.7 THREADED RIVET BASEPLATE WITH UNTHREADED INSERT www.murata-ps.com/support MDC_PAH-28Vout-350W.
PAGE 15
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters SHIPPING TRAYS: LOW DENSITY CLOSED CELL POLYETHYLENE STATIC DISSIPATIVE FOAM +.000 2.300 (58.42) TYP 9.920 -.062 (251.97) 0.625 (15.86) TYP 0.50 (12.7) 9.920 +.000 -.062 (251.97) 0.625 (15.86) TYP 2.400 (60.96) TYP 1.150 (29.21) TYP .25 (6.35) R TYP .25 (6.35) CHAMFER TYP (4-PL) SHIPPING BOXES Anti-static foam Label top side Dimensions are in inches (mm shown for ref. only).
PAGE 16
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, 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.
PAGE 17
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters 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. +SENSE +VOUT C1 C2 SCOPE RLOAD –VOUT –SENSE C1 = 1μF C2 = 470μF LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 3.
PAGE 18
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters 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.
PAGE 19
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Negative-logic 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 +15V 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.
PAGE 20
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, 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.
PAGE 21
PAH-28 Vout, 350-Watt Series Isolated, 350-Watt, Half-Brick DC-DC Converters Vertical Wind Tunnel IR Transparent optical window Unit under test (UUT) Variable speed fan IR Video Camera Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airﬂow and heat dissipation analysis of power products.