current limiting protection, and thermal shutdown.
F1
+Vin
Barrier
+Vout
Case ground
External
DC
Power
Source
Controller
and Power
On/Off
Control
Open = On
Reference and
Error Amplifier
Trim
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.A03
Page 1 of 16
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
±0.25%
Root Model
➀
PAH-28/12.5-D48
I
OUT
(Amps,
Max.)
12.5
Power
(Watts)
350
R/N (mV pk-pk)
Typ.
100
Max.
300
Load
±0.25%
V
IN
Nom.
(Volts)
48
Range
(Volts)
36-75
I
IN
, no
load
(mA)
80
I
IN
, full
load
(Amps)
7.84
Efficiency
Min.
➃
92%
Typ.
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.
➃
Minimum efficiency applies to all input voltages and working temperatures.
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
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)
*
Input Voltage Range:
D48 = 36-75 Volts (48V nominal)
On/Off Control Logic
N
= Negative logic
P
= Positive logic
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.A03
Page 2 of 16
PAH-28 Vout, 350-Watt Series
Isolated, 350-Watt, 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
Full power operation
Operating or non-operating, tested:
100 mS max. duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
Minimum
0
0
Typical/Nominal
Maximum
80
100
2250
Units
Vdc
Vdc
Vdc
Vdc
Vdc
W
None
0
0
15
355.25
350
Current-limited, no damage,
Output Current
0
12.5
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.
INPUT
Operating voltage range
Recommended External Fuse
Turn On/Start-up threshold tested at 1/2 load
Turn Off/Undervoltage lockout tested at 1/2 load
Reverse Polarity Protection
Internal Filter Type
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load Input Current
Shut-Down Mode Input Current
Reflected (back) ripple current
➁
36
Fast blow
Rising input voltage
Falling input voltage
None, install external fuse
33
31
48
34
32
None
Pi
7.84
10.57
2.5
60
80
5
40
92
91.0
93
92.0
2250
1500
1500
basic
10
1,000
Yes
1.2
380
Power On to Vout regulated
(100% 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
420
25
25
2500
±500
460
50
50
3500
±1000
Hours x 10
6
KHz
mS
mS
μSec
mV
75
20
35
33
Vdc
A
Vdc
Vdc
Vdc
Vin = nominal
Vin = minimum
Iout = minimum, unit=ON
Measured at input with specified filter
Vin=48V, full load, +25˚C.
@ Vin=Max
Input to output, continuous
Input to Baseplate, continuous
Output to Baseplate, continuous
8.04
10.84
5
100
100
10
80
A
A
A
2
-Sec.
mA
mA
mA
mA, pk-pk
%
%
Vdc
GENERAL and SAFETY
Efficiency
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Certified to UL-60950-1, CSA-C22.2 No.60950-
1, IEC/EN60950-1, 2nd edition
Per Telcordia SR332, issue 1 class 3, ground
fixed, Tambient=+25˚C
Mohm
pF
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control
➂
“N” suffix:
Negative Logic, ON state
Negative Logic, OFF state
Control Current
“P” suffix:
Positive Logic, ON state
Positive Logic, OFF state
Control Current
Remote Sense Compliance
Pin open=ON or
open collector/drain
Pin open=ON or
open collector/drain
Vsense=Vout–Vload, Sense connected at load
–0.1
2.5
1
3.5
0
1
0.8
15
2
15
1
2
10
V
V
mA
V
V
mA
% of Vout
www.murata-ps.com/support
MDC_PAH-28Vout-350W.A03
Page 3 of 16
PAH-28 Vout, 350-Watt Series
Isolated, 350-Watt, 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
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
External output capacitance required
➅
See Derating
No trim
At 50% load
User-adjustable
Via magnetic feedback
0.0
27.58
-1.5
16.8(-40%)
34
0
98% of Vnom., after warmup
Hiccup technique, autorecovery within ±1% of
Vout
Output shorted to ground, no damage
Current limiting
Vin=min. to max. Vout=nom.
Iout=min. to max. Vin=48V.
5 Hz- 20 MHz BW
At all outputs
Cap. ESR=<0.02Ω, Full resistive load
with baseplate; see mechanical drawings
±0.25
±0.25
300
4700
2.3 X 2.4 X 0.5
58.4x60.96x12.7
3.67
104
0.040/0.06
1.016/1.524
Copper alloy
100-299
10.31
Aluminum
-40
-40
-55
115
85
120
125
130
%
%
mV pk-pk
% of Vnom./°C
μF
Inches
mm
Ounces
Grams
Inches
mm
μ-inches
μ-inches
16
No minimum load
19
0.01
Continuous
350
28
355.25
28.42
1.5
32.2(+15%)
50
12.5
25
0.1
W
Vdc
% of Vnom.
Vdc
Vdc
A
A
A
36
100
±0.015
470
MECHANICAL (Through Hole Models)
Outline Dimensions
Weight
Through Hole Pin Diameter
Through Hole Pin Material
TH Pin Plating Metal and Thickness
Case or Baseplate Material
Pins 1–4, 6–8/5,9
Nickel subplate
Gold overplate
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Radiated, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
(must derate -1%/1000 feet)
RoHS rating
With derating, full power, measured at Tref
Vin = Zero (no power)
Measured in center
External filter required
To +85°C
10
-500
-152
RoHS-6
˚C
˚C
˚C
˚C
Class
90
10,000
3048
Class
%RH
feet
meters
125
B
B
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 470
μF output capacitors. A 220μF external input capacitors is required. All capacitors are low-ESR
types wired close to the converter.
➁
Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering
is Cbus=220 μF/100V, Cin=470 μF/100V and Lbus=12 μH.
➂
The Remote On/Off Control is referred to -Vin.
➃
Over-current protection is non-latching with auto reovery (Hiccup)
➄
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.
➅
Required minimum output capacitance is 470 μF, low ESR.
www.murata-ps.com/support
MDC_PAH-28Vout-350W.A03
Page 4 of 16
PAH-28 Vout, 350-Watt Series
Isolated, 350-Watt, Half-Brick DC-DC Converters
TYPICAL PERFORMANCE DATA
Efficiency and Power Dissipation, Ambient Temperature = +25°C
96
92
88
Efficiency (%)
84
80
76
72
68
64
60
1.25
2.5
3.75
5
6.25
7.5
Iout (Amps)
8.75
10
11.25
Power Dissipation
V
IN
= 48V
V
IN
= 75V
V
IN
= 48V
V
IN
= 36V
36
32
28
Output Power Derating in Conduction Cooling (Cold Baseplate) Applications
(Vin=48V, Ambient Temperature <70°C)
375
350
Dissipation (Watts)
Output Power (Watts)
24
20
16
12
8
4
0
12.5
325
300
275
250
20
30
40
50
60
70
80
90
100
Cold Baseplate (Interior) Temperature
(°C)
Maximum Current Temperature Derating at sea level
(Vin=48V, transverse airflow, from Vin- to Vout+, with baseplate)
14
12
10
8
6
4
2
0
0.25 m/s (50 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2.5 m/s (500 LFM)
3.0 m/s (600 LFM)
14
12
10
8
6
4
2
0
Maximum Current Temperature Derating at sea level
(Vin=48V, longitudinal airflow, from Vin to Vout, with baseplate)
Output Current (Amps)
Output Current (Amps)
0.25 m/s (50 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2.5 m/s (500 LFM)
3.0 m/s (600 LFM)
30
35
40
45
50
55
60
65
70
75
80
85
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature
(°C)
Ambient Temperature
(°C)
Maximum Current Temperature Derating at sea level
(Vin=48V, transverse airflow, from Vin- to Vout+, with baseplate)
360
340
320
Output Power (Watts)
Output Power (Watts)
300
280
260
240
220
200
180
160
30
35
40
45
50
55
60
65
70
75
80
85
0.25 m/s (50 LFM)
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
1.5 m/s (300 LFM)
2.0 m/s (400 LFM)
2.5 m/s (500 LFM)
3.0 m/s (600 LFM)
360
340
320
300
280
260
240
220
200
180
160
30
Maximum Current Temperature Derating at sea level
(Vin=48V, longitudinal airflow, from Vin to Vout, with baseplate)
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