www.murata-ps.com

PAH-28 Vout, 350-Watt Series

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

Output (V)

28

Current (A)

12.5

Input Voltage (V)

18-36 or 36-75

Typical unit

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 Efficiency: 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)



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

60950-1, 2nd edition safety approvals

PRODUCT OVERVIEW

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 amplifier

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 efficiency

(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.

F1

+Vin

Barrier

+Vout

Case ground

External

DC

Power

Source

Open = On

Controller

and Power

NOTE: A minimum of 470µF

of capacitance is required

on the output to ensure

Cout stable operation. An ESR

equal to or less than 0.02

is also required.

Trim

On/Off

Control

Reference and

Error Ampliﬁer

logic)

-Vin

-Vout

Figure 1. Simplified Schematic

Typical topology is shown. Some models may vary slightly.

For full details go to

www.murata-ps.com/rohs

www.murata-ps.com/support

MDC_PAH-28Vout-350W.B06

Page 1 of 21

PAH-28 Vout, 350-Watt Series

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

PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE

Output

V

OUT

(Volts)

28

Input

Regulation (Max.)

Line

±0.125%

±0.25%

Root Model

➀

PAH-28/12.5-D24

PAH-28/12.5-D48

I

OUT

(Amps,

Max.)

12.5

Power

(Watts)

350

R/N (mV pk-pk)

Typ.

75

100

Max.

200

300

Load

±0.25%

V

IN

Nom.

(Volts)

24

48

Range

(Volts)

18-36

36-75

I

IN

, no

load

(mA)

80

I

IN

, full

load

(Amps)

15.7

7.84

Efficiency

Min.

91%

91.5%

Typ.

92.5%

93%

Dimensions

(inches)

2.3 x 2.4 x 0.5

➀

Please refer to the part number structure for additional ordering part numbers and options.

➁

All specifications are at nominal line voltage and full load, +25°C. unless otherwise noted. See

detailed specifications.

➂

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

PART NUMBER STRUCTURE

PAH

-

28

/

12.5

-

D48 N Bx H Lx

-

C

Power Amplifier

Half-Brick

Nominal Output Voltage

Maximum Output Current

in Amps

Input Voltage Range:

D24 = 18-36 Volts (24V nominal)

D48 = 36-75 Volts (48V nominal)

On/Off Control Logic

N

= Negative logic

P

= Positive logic

Pin length option

Blank

= standard pin length 0.180 in. (4.57 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

*

Baseplate (installed on all models)

B

= Baseplate installed with standard M3-12.7 threaded rivet (typ. 4)

B1

= Baseplate installed with unthreaded insert

(see Mechanical section for details).

RoHS Hazardous Materials compliance

C =

RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder

*

Minimum order quantity 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.

www.murata-ps.com/support

MDC_PAH-28Vout-350W.B06

Page 2 of 21

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

Output Current

Conditions

100 mS max. duration

Input to output

Power on, referred to -Vin

Minimum

0

Typical/Nominal

Maximum

36

50

2250

13.5

357

Units

Vdc

W

0

Current-limited, no damage, short-circuit

0

12.5

A

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.

INPUT

Operating voltage range

Start-up threshold

Undervoltage shutdown

Internal Filter Type

External Input fuse

Input current

Full Load Conditions

Low Line input current

Inrush Transient

Short Circuit input current

No Load input current

Shut-Down input currrent(Off, UV, OT)

Back Ripple Current

18

14.5

11.5

24

36

16.5

14

35

Vin = nominal

Vin = minimum

Vin = 24V.

Iout = minimum, unit=ON

15.77

1

0.03

80

5

80

91

92.5

2250

1500

Basic

10

1500

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

1, IEC/EN60950-1, 2nd edition (pending)

Per Telcordia SR-332, Issue 2, Method 1, Class

1, Ground Fixed, Tcase=+25°C

Pending

1200

300

Vin On to 10% Vout or Remote On to 10% Vout

10% Vout to 90% Vout

25

28

50-75-50%, 1A/µs,within 1% of Vout

same as above

±200

35

100

±400

Hours x 10

3

KHz

mS

µSec

mV

16.26

22

0.10

100

15

120

Vdc

A

2

-Sec.

A

mA

mA, pk-pk

%

Vdc

MΩ

pF

Pi

GENERAL and SAFETY

Efficiency

Isolation

Isolation Voltage

Insulation Safety Rating

Isolation Resistance

Isolation Capacitance

Safety

Calculated MTBF

Vin=24V, full load

Input to output

Input to Baseplate

Output to Baseplate

DYNAMIC CHARACTERISTICS

Fixed Switching Frequency

Turn On Time

Startup Delay

Rise Time

Vout Rise Time

From 0%~100%

Dynamic Load Response

Dynamic Load Peak Deviation

FEATURES and OPTIONS

Remote On/Off Control

“P” suffix:

Positive Logic, ON state

Positive Logic, OFF state

Control Current

“N” suffix:

Negative Logic, ON state

Negative Logic, OFF state

Control Current

Remote Sense Compliance

ON = pin open or external voltage

OFF = ground pin or external voltage

open collector/drain

ON = ground pin or external voltage

OFF = pin open or external voltage

open collector/drain

Sense pins connected externally to respective

Vout pins

3.5

0

1

-0.1

2.5

1

13.5

1

2

0.8

13.5

2

V

mA

V

mA

% of Vout

www.murata-ps.com/support

MDC_PAH-28Vout-350W.B06

Page 3 of 21

PAH-28 Vout, 350-Watt Series

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

FUNCTIONAL SPECIFICATIONS, PAH-28/12.5-D24 (CONT.)

OUTPUT

Total Output Power

Voltage

Setting Accuracy

Output Adjust Range

Overvoltage Protection

Current

Output Current Range

Minimum Load

Current Limit Inception

➃

Short Circuit

Short Circuit Current

Short Circuit Duration

(remove short for recovery)

Short circuit protection method

Regulation

➄

Line Regulation

Load Regulation

Ripple and Noise

Temperature Coefficient

Maximum Output Capacitance

Conditions

At 100% load, no trim, all conditions

Minimum

0

27.44

16.8

34

0

Typical/Nominal

350

28

34.6

12.5

No minimum load

16

0.03

Continuous

Non-latching

Maximum

357

28.56

32.2

37

12.5

19

Units

W

Vdc

A

98% of Vnom., cold

Hiccup technique,

autorecovery within ±1% of Vout

Output shorted to ground, no damage

Hiccup current limiting

Vin = 18-36, Vout = nom., full load

Iout = min. to max., Vin = nom.

20 MHz BW, Cout = 1µF paralleled with 10µF

At all outputs

(Loads : CR mode)

(Loads : CC mode)

with baseplate; see mechanical drawings

14

75

0.02

470

2.3 x 2.4 x 0.5

58.4 x 60.96 x 12.7

3.42

97

0.04/0.08

1.016/2.032

Copper alloy

100-299

10.31

-40

-55

115

125

B

RoHS-6

±0.125

±0.25

200

3,300

2,200

%

mV pk-pk

% of Vnom./°C

μF

Inches

mm

Ounces

Grams

Inches

mm

µ-inches

MECHANICAL

Outline Dimensions

Weight

Through Hole Pin Diameter

Through Hole Pin Material

TH Pin Plating Metal and Thickness

Pins 1–4, 6–8/5,9

Nickel subplate

Gold overplate

with derating

Vin = Zero (no power)

ENVIRONMENTAL

Operating Ambient Temperature Range

Operating Baseplate Temperature

Storage Temperature

Thermal Protection/Shutdown

(with "B" Suffix)

Electromagnetic Interference

Conducted, EN55022/CISPR22

RoHS rating

85

115

125

130

˚C

Class

External filter required;

see emissions performance test.

www.murata-ps.com/support

MDC_PAH-28Vout-350W.B06

Page 4 of 21

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

92

88

Efﬁciency (%)

84

80

76

72

68

64

0.5

1.7

2.9

4.1

5.3

6.5

7.7

Iout (Amps)

8.9

10.1

11.3

V

IN

= 36V

V

IN

= 24V

V

IN

= 18V

32

28

24

20

16

Power Dissipation

V

IN

= 24V

12

8

4

0

12.5

Dissipation (Watts)

www.murata-ps.com/support

MDC_PAH-28Vout-350W.B06

Page 5 of 21

参数名称	属性值
包装说明	,
Reach Compliance Code	unknown
模拟集成电路 - 其他类型	DC-DC REGULATED POWER SUPPLY MODULE
Base Number Matches	1

	PAH-28/12.5-D24PB-C	PAH-28/12.5-D48NB-C	PAH-28/12.5-D48NB1-C
描述	DC DC CONVERTER 28V 350W	DC DC CONVERTER 28V 350W	DC DC CONVERTER 28V 350W
Reach Compliance Code	unknown	unknown	compliant
模拟集成电路 - 其他类型	DC-DC REGULATED POWER SUPPLY MODULE	DC-DC REGULATED POWER SUPPLY MODULE	DC-DC REGULATED POWER SUPPLY MODULE
Base Number Matches	1	1	1

PAH-28/12.5-D24PB-C

PAH-28/12.5-D24PB-C概述

PAH-28/12.5-D24PB-C规格参数

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