PAH 48, 53 Vout, 450W Series
www.murata-ps.com
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
Output (V)
Current (A)
Input Voltage (V)
48
8.5
36-75
53
8.5
36-75
Typical unit
FEATURES
PRODUCT OVERVIEW
Wide Vout trim range (see specifications)
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.
Industry standard “half brick” package
High efficiency: up to 94%
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
The PAH Series is ideal for power amplifier
applications, semiconductor test equipment,
wireless networks, and telecom applications.
The baseplate provides a means for conduction cooling in demanding thermal environment
conditions.
The module provides a 53Vdc or 48Vdc output
at 8.5 Amps and accepts a wide input voltage
range of 36-75Vdc. The PAH topology offers high
efficiency (up to 94%), 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 features also include input under-voltage shutdown,
output over-voltage protection, output short-circuit/
current limiting protection, and thermal shutdown.
Thermal shutdown
Output short circuit protection (hiccup
technique)
Certified to UL/60950-1, CSA-C22.2 No.
60950-1, 2nd edition safety approvals
+Vin
F1
+Vout
Barrier
Case ground
External
DC
Power
Source
NOTE: A minimum of 220μF
of capacitance is required
on the output to ensure
Cout stable operation. An ESR
equal to or less than 0.02Ω
is also required.
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-48-53Vout-450W.A09 Page 1 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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-48/8.5-D48
48
8.5
408
75
200
PAH-53/8.5-D48
53
8.5
450.5
75
200
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)
±0.6%
±0.6%
48
36-75
80
9.98
90%
94%
2.3x2.4x0.5
±0.6%
±0.6%
48
36-75
80
9.98
90%
94%
2.3x2.4x0.5
Regulation (Max.)
➀ Please refer to the full model number structure for additional ordering part numbers and options.
➁ All specifications are typical at nominal line voltage and full load, +25ºC. 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 - 53 / 8.5 - D48 N Bx H Lx - C
Power Amplifier
Half-Brick
RoHS Hazardous Materials compliance
C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder
Nominal Output Voltage
Maximum Output Current
in Amps
Input Voltage Range:
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) ➀
L2 = 0.145 in. (3.68 mm) ➀
Conformal coating (optional)
Blank = no coating, standard
H = Coating added ➀
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).
➀ Special quantity order is required; samples available with standard pin length only.
➁ Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
MDC_PAH-48-53Vout-450W.A09 Page 2 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, PAH-48/8.5-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. duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
0
Typical/Nominal
0
Maximum
Units
80
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
408
15
414.12
Current-limited, no damage,
0
8.5
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.
Output Current
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
Short Circuit Input Current
No Load Input Current
Shut-Down Mode Input Current
Reflected (back) ripple current ➁
Fast blow
Rising input voltage
Falling input voltage
None, install external fuse
36
48
33
31
34
32
None
Pi
Vin = nominal
Vin = minimum
9.98
13.31
0.2
60
80
5
40
Iout = minimum, unit=ON
Measured at input with specified filter
75
20
35
33
Vdc
A
Vdc
Vdc
Vdc
10.58
13.96
0.5
200
150
10
80
A
A
A2-Sec.
mA
mA
mA
mA, pk-pk
GENERAL and SAFETY
Efficiency
Vin=48V, full load, +25˚C.
@ Vin=Min
90
91
Input to output, continuous
Input to Baseplate, continuous
Output to Baseplate, continuous
2250
1500
1500
94
94
%
%
Isolation
Isolation Voltage
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Vdc
basic
10
3300
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/60950-1, 2nd edition
Per Telcordia SR332, issue 1 class 3, ground
fixed, Tambient=+25˚C
Mohm
pF
Yes
1.6
Hours x 106
160
KHz
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
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
50
100
mS
50
100
mS
100
μSec
±400
±600
mV
1
0.8
15
2
V
V
mA
15
1
2
5
V
V
mA
% of Vout
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
–0.1
2.5
open collector/drain
Pin open=ON or
open collector/drain
Vsense=Vout–Vload, Sense connected at load
3.5
0
1
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MDC_PAH-48-53Vout-450W.A09 Page 3 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, PAH-48/8.5-D48 (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
408
414.12
W
48
1.5
48.72
55.2(15%)
70
Vdc
% of Vnom.
Vdc
Vdc
8.5
No minimum load
12
8.5
A
15
A
Hiccup technique, autorecovery within ±1% of
Vout
0.5
5.0
A
Output shorted to ground, no damage
Continuous
±0.6
±0.6
200
%
%
mV pk-pk
% of Vnom./°C
μF
No trim
At 50% load
User-adjustable
Via magnetic feedback
47.28
28.8(40%)
52.8
0
98% of Vnom., after warmup
9
57.6
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
75
.02
220
1000
MECHANICAL (Through Hole Models)
Outline Dimensions
with baseplate; see mechanical drawing
2.3 X 2.4 X 0.5
58.4x60.96x12.7
3.33
94.4
0.040/0.06
1.016/1.524
Copper alloy
100-299
10.31
Aluminum
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
Case or Baseplate Material
Inches
mm
Ounces
Grams
Inches
mm
μ-inches
μ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
(must derate -1%/1000 feet)
RoHS rating
Notes
See derating curves
Vin = Zero (no power)
Measured in center
-40
-40
-55
115
External filter required
To +85°C
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.
125
85
115
125
130
B
˚C
˚C
˚C
˚C
Class
10
-500
-152
90
10,000
3048
%RH
feet
meters
RoHS-6
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 220 μF, low ESR.
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MDC_PAH-48-53Vout-450W.A09 Page 4 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
TYPICAL PERFORMANCE DATA, PAH-48/8.5-D48
78
72
66
60
54
48
42
36
30
24
18
12
6
0
VIN = 75V
VIN = 48V
VIN = 36V
Power Dissipation
VIN = 48V
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
475
450
Output Power (Watts)
98
96
94
92
90
88
86
84
82
80
78
76
74
72
Output Power Derating in Conduction Cooling (Cold Baseplate) Applications
(Vin=48V, Ambient Temperature <70°C)
Dissipation (Watts)
Efficiency (%)
Efficiency and Power Dissipation @ Ta = +25°C
425
400
375
8.5
350
20
Iout (Amps)
30
40
50
60
70
80
90
100
Cold Baseplate (Interior) Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin=48V, longitudinal airflow, on 10˝ x 10˝ PCB with baseplate)
9
9
8
8
7
7
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin=48V, transverse airflow, on 10˝ x 10˝ PCB with baseplate)
6
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)
5
4
3
2
30
35
40
45
6
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)
5
4
3
50
55
60
65
70
75
80
2
85
30
35
40
45
50
Ambient Temperature (°C)
450
420
420
390
390
Output Power (Watts)
Output Power (Watts)
480
450
360
330
240
210
180
35
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)
40
45
60
65
Ambient Temperature (°C)
75
80
85
80
85
330
300
270
210
55
70
360
240
50
65
Maximum Power Temperature Derating at sea level
(Vin=48V, longitudinal airflow, on 10˝ x 10˝ PCB with baseplate)
480
270
60
Ambient Temperature (°C)
Maximum Power Temperature Derating at sea level
(Vin=48V, transverse airflow, on 10˝ x 10˝ PCB with baseplate)
300
55
70
75
80
85
180
35
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)
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_PAH-48-53Vout-450W.A09 Page 5 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, PAH-53/8.5-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. duration
Input to output
None, install external fuse
Power on or off, referred to -Vin
0
Typical/Nominal
0
Maximum
Units
80
Vdc
100
Vdc
2250
Vdc
Vdc
Vdc
W
None
0
0
450.5
15
457.26
Current-limited, no damage,
0
8.5
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.
Output Current
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
Short Circuit Input Current
No Load Input Current
Shut-Down Mode Input Current
Reflected (back) ripple current ➁
Fast blow
Rising input voltage
Falling input voltage
None, install external fuse
36
48
33
31
34
32
None
Pi
Vin = nominal
Vin = minimum
9.98
13.31
0.2
60
80
5
40
Iout = minimum, unit=ON
Measured at input with specified filter
75
20
35
33
Vdc
A
Vdc
Vdc
Vdc
10.58
13.96
0.5
200
150
10
80
A
A
A2-Sec.
mA
mA
mA
mA, pk-pk
GENERAL and SAFETY
Efficiency
Vin=48V, full load, +25˚C.
@ Vin=Min
90
91
94
94
%
%
2250
1500
1500
basic
10
1,500
Vdc
Isolation
Isolation Voltage
Input to output, continuous
Input to Baseplate, continuous
Output to Baseplate, continuous
Insulation Safety Rating
Isolation Resistance
Isolation Capacitance
Safety
Calculated MTBF
Certified to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/60950-1, 2nd edition
Per Telcordia SR332, issue 1 class 3, ground
fixed, Tambient=+25˚C
Mohm
pF
Yes
1.6
Hours x 106
160
KHz
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic Load Peak Deviation
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
50
100
mS
50
100
mS
100
μSec
±400
±600
mV
1
0.8
15
2
V
V
mA
15
1
2
5
V
V
mA
% of Vout
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
Remote Sense Compliance
Base Plate
Pin open=ON or
–0.1
2.5
open collector/drain
Pin open=ON or
open collector/drain
Vsense=Vout–Vload, Sense connected at load
“B” suffix
3.5
0
1
www.murata-ps.com/support
MDC_PAH-48-53Vout-450W.A09 Page 6 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
FUNCTIONAL SPECIFICATIONS, PAH-53/8.5-D48 (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
450.5
457.26
W
53
1.5
53.795
55.65(+5%)
70
Vdc
% of Vnom.
Vdc
Vdc
8.5
No minimum load
12
8.5
A
15
A
Hiccup technique, autorecovery within ±1% of
Vout
0.5
5.0
A
Output shorted to ground, no damage
Continuous
±0.6
±0.6
200
%
%
mV pk-pk
% of Vnom./°C
μF
No trim
At 50% load
User-adjustable
Via magnetic feedback
52.205
26.5(-50%)
58.3
0
98% of Vnom., after warmup
9
63.6
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
75
.02
220
1000
MECHANICAL (Through Hole Models)
Outline Dimensions
with baseplate; see mechanical drawing
2.3 X 2.4 X 0.5
58.4x60.96x12.7
3.33
94.4
0.040/0.06
1.016/1.524
Copper alloy
100-299
10.31
Aluminum
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
Case or Baseplate Material
Inches
mm
Ounces
Grams
Inches
mm
μ-inches
μ-inches
ENVIRONMENTAL
Operating Ambient Temperature Range
Operating Case Temperature
Storage Temperature
Thermal Protection/Shutdown
Electromagnetic Interference
Conducted, EN55022/CISPR22
Relative humidity, non-condensing
Altitude
(must derate -1%/1000 feet)
RoHS rating
Notes
See derating curves
Vin = Zero (no power)
Measured in center
-40
-40
-55
115
External filter required
To +85°C
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.
125
85
115
125
130
B
˚C
˚C
˚C
˚C
Class
10
-500
-152
90
10,000
3048
%RH
feet
meters
RoHS-6
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 220 μF, low ESR.
www.murata-ps.com/support
MDC_PAH-48-53Vout-450W.A09 Page 7 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
TYPICAL PERFORMANCE DATA, PAH-53/8.5-D48
78
72
66
60
54
48
42
36
30
24
18
12
6
0
VIN = 75V
VIN = 48V
VIN = 36V
Power Dissipation
VIN = 48V
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
475
450
Output Power (Watts)
98
96
94
92
90
88
86
84
82
80
78
76
74
72
Output Power Derating in Conduction Cooling (Cold Baseplate) Applications
(Vin=48V, Ambient Temperature <70°C)
Dissipation (Watts)
Efficiency (%)
Efficiency and Power Dissipation @ Ta = +25°C
425
400
375
8.5
350
20
Iout (Amps)
30
40
50
60
70
80
90
100
Cold Baseplate (Interior) Temperature (°C)
Maximum Current Temperature Derating at sea level
(Vin=48V, longitudinal airflow, on 10˝ x 10˝ PCB with baseplate)
9
9
8
8
7
7
Output Current (Amps)
Output Current (Amps)
Maximum Current Temperature Derating at sea level
(Vin=48V, transverse airflow, on 10˝ x 10˝ PCB with baseplate)
6
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)
5
4
3
2
30
35
40
45
6
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)
5
4
3
50
55
60
65
70
75
80
2
85
30
35
40
45
50
Ambient Temperature (°C)
450
420
420
390
390
Output Power (Watts)
Output Power (Watts)
480
450
360
330
240
210
180
35
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)
40
45
60
65
Ambient Temperature (°C)
75
80
85
80
85
330
300
270
210
55
70
360
240
50
65
Maximum Power Temperature Derating at sea level
(Vin=48V, longitudinal airflow, on 10˝ x 10˝ PCB with baseplate)
480
270
60
Ambient Temperature (°C)
Maximum Power Temperature Derating at sea level
(Vin=48V, transverse airflow, on 10˝ x 10˝ PCB with baseplate)
300
55
70
75
80
85
180
35
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)
40
45
50
55
60
65
70
75
Ambient Temperature (°C)
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MDC_PAH-48-53Vout-450W.A09 Page 8 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
OSCILLOGRAMS, PAH-53/8.5-D48
Output ripple and Noise (Vin=48V, Iout=0A, Cload=220uf, Ta=+25°C)
Vo ripple=13.8mV
Output ripple and Noise (Vin=48V, Iout=8.5A, Cload=220uf, Ta=+25°C)
Vo ripple=64mV
On/Off Enable Start-up (Vin=48V, Vout=nom, Iout=0A, Cload=220uF, Ta=+25°C)
On/Off Enable Start-up (Vin=48V, Vout=nom, Iout=8.5A, Cload=220uF, Ta=+25°C)
On/Off Enable Start-up (Vin=48V, Vout=nom, Iout=8.5A, Cload=1000uF, Ta=+25°C)
Start-up Delay (Vin=48V, Vout=nom, Iout=0A, Cload=220uF, Ta=+25°C)
Trace 1=Vin, Trace2= Vout
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MDC_PAH-48-53Vout-450W.A09 Page 9 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
OSCILLOGRAMS, PAH-53/8.5-D48
Start-up Delay (Vin=48V, Vout=nom, Iout=8.5A, Cload=220uF, Ta=+25°C)
Trace 1=Vin, Trace2= Vout
Start-up Delay (Vin=48V, Vout=nom, Iout=8.5A, Cload=1000uF, Ta=+25°C)
Trace 1=Vin, Trace2= Vout
Step Load Transient Response (Vin=48V, Vout=nom, Cload=220uF, Iout=50-75-50%
of full load (1As/us ), Ta=+25°C)
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MDC_PAH-48-53Vout-450W.A09 Page 10 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
MECHANICAL SPECIFICATIONS
NOTE: A metal nut is used to
connect the case pin to ground.
0.50 (12.7)
0.008 (0.20) Min
8
7
3
6
4
5
2.30 (58.42)
SECTION A-A
0.36
(9.14)
INPUT/OUTPUT CONNECTIONS
Pin
Function
1
−Vin
2
Case ground
3
On/Off Control
4
+Vin
5
+Vout
6
+Sense
7
Trim
8
−Sense
9
−Vout
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
SEE NOTE 8
0.37 (9.4) 1.07 (27.18)
2.00 (50.8)
1.900 (48.26)
Top View
Third Angle Projection
L
0.50 (12.7)
0.69 (17.53)
MOUNTING INSERT OPTIONAL
B: M3 THREAD TYP 4PL
B1: ij 3.2 THRU HOLE TYP 4PL
Dimensions are in inches (mm shown for ref. only).
0.010 (0.254) Min
Bottom Pin Side View
PINS 1-4,6-8:
ij 0.040±0.001(1.016±0.025)
PINS 5,9:
ij 0.082±0.001(2.083±0.025)
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
Components are shown for reference only.
NOTES:
UNLESS OTHERWISE SPECIFIED:
1:FOR OPTIONAL M3, THE M3 SCREW USED TO BOLT UNIT'S BASEPLATE TO OTHER
SURFACES (SUCH AS HEATSINK) MUST NOTOUT OF THE RANGE FROM 0.138''(3.5mm) TO
0.236''(6mm)DEPTH BELOW THE SURFACE OF BASEPLATE
2:APPLIED TORQUE PER SCREW SHOULD NOT EXCEED 5.3In-lb(0.6Nm);
3:ALL DIMENSION ARE IN INCHES[MILIMETER];
4:ALL TOLERANCES: ×.××in ,±0.02in(×.×mm,±0.5mm)
×.×××in ,±0.01in(×.××mm,±0.25mm)
5:COMPONENTS WILL VARY BETWEEN MODELS
6:OVERALL DIMENSIONS:2.30(58.42)×2.4(60.96)×0.50(12.7)
BEFORE REMOVAL OF PROTECTIVE HEAT SHIELD;
7:*THE REMOTE ON/OFF CAN BE PROV IDED WITH EITHER POSITIVE OR NEGATIVE ("N"SUFFIX) LOGIC
8:STANDARD PIN LENGTH: 0.180 Inch
FOR L2 PIN LENGTH OPTION IN MODEL NAME, USE STANDARD L2 PIN WITH PIN LENGTH TO 0.145 Inch
9:THE SQUARE HOLE IN THE BASEPLATE PROVIDES CLEARANCE BETWEEN THE BASEPLATE AND THE CURRENT
TRANSFORMER ON THE PCB, TO MAINTAIN THE ISOLATION BARRIER.
WE RECOMMENDED A THERMAL PAD LIKE THE Q-PAD 3 FROM THE BERGQUIST COMPANY. NO SPECIAL ATTENTION
IS REQUIRED ON THE THERMAL CONDUCTIVE MATERIAL. MOST MATERIALS CAN BE USED AND WILL WORK WHEN
THE THERMAL CONDUCTIVE MATERIAL DROPS INTO THE HOLE.
Since there is some pinout 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.
* Note that the “case” connects to the baseplate (when installed). This case connection is
isolated from the rest of the converter. Pin 2 may be deleted under special order. Please contact
Murata Power Solutions for information.
The Trim connection may be left open and the converter will achieve its rated output voltage.
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MDC_PAH-48-53Vout-450W.A09 Page 11 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
BASEPLATE WITH STANDARD M3-12.7 THREADED RIVET
BASEPLATE WITH UNTHREADED INSERT
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MDC_PAH-48-53Vout-450W.A09 Page 12 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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).
Third Angle Projection
Components are shown for reference only.
4.25
(107.95)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
10
(25
4)
10 )
4
(25
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MDC_PAH-48-53Vout-450W.A09 Page 13 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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. For
safety agency approvals, install the converter in compliance with the end-user
safety standard.
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.
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.
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 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
CURRENT
PROBE
+Vin
VIN
+
–
+
–
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.
Input Source Impedance
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MDC_PAH-48-53Vout-450W.A09 Page 14 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, Half-Brick DC-DC Converters
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.
+SENSE
+VOUT
C1
C2
SCOPE
RLOAD
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.
–VOUT
–SENSE
C1 = 1μF CERAMIC
C2 = 220μF LOW ESR
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 sheet illustrate 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”).
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 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_PAH-48-53Vout-450W.A09 Page 15 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 Watt, 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.
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 ensure:
TRIM
LOAD
R TRIM UP
–SENSE
(Vout at pins) x (Iout) ≤ (Max. rated output power)
–VIN
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
–VOUT
Figure 6. Trim adjustments to Increase Output Voltage using a Fixed Resistor
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MDC_PAH-48-53Vout-450W.A09 Page 16 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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. Trim adjustments to Decrease Output Voltage using a Fixed Resistor
–VIN
Trim Equations
Radj_up (in kΩ) = Vnominal x (1+Δ) - 1 - 2
1.225 x Δ
Δ
where Δ =
Figure 9. Driving the Negative Logic 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
Radj_down (in kΩ) = - 2
Δ
Vnominal -Vout
where Δ =
Vnominal
There are two CAUTIONs for the On/Off Control:
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.
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 logic type.
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 models are enabled when the On/Off pin is left open or is pulled
high to +15V with respect to –Vin. Some models will also turn on at lower
intermediate voltages (see Specifications). Positive-logic devices are disabled
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 Logic On/Off Control Pin
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MDC_PAH-48-53Vout-450W.A09 Page 17 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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.
[3] Conducted Emissions Test Results
[4]] Layout
Layyout
La
utt R
eccomme
m nddattio
me
ions
ns
Recommendations
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.
L1
C2
C9
L2
C7
C8
C10
Module
C1
Graph 1. Conducted emissions performance, Positive Line,
CISPR 22, Class B, 48 Vin, full load
C6
C5
C3
C4
Figure 10. Conducted Emissions Test Circuit
Reference
Part Number
Description
Vendor
CAP SMT NON POL CERAMIC
C1, C2, C7,
GRM32ER72A225KA35L
X7R 2.2UF 100V 20%
Murata
C9, C10
1210
COMMON MODE-809uHL1, L2
±25%-9.7A-R5K28*26*12.7mm
SMD CERAMIC 630V-0.22uFC3, C4, C5, C6 GRM55DR72J224KW01L
Murata
±10%-X7R-2220
Aluminum 100V-33UfC8
UHE2A221MHD
Nichicon
±10%-long lead
[1] Conducted Emissions Parts List
[2] Conducted Emissions Test Equipment Used
Hewlett Packard HP8594L Spectrum Analyzer – S/N 3827A00153
Graph 2. Conducted emissions performance, Negative Line,
CISPR 22, Class B, 48 Vin, full load
2Line V-networks LS1-15V 50Ω/50Uh Line Impedance Stabilization Network
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 GEAN02 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_PAH-48-53Vout-450W.A09 Page 18 of 19
PAH 48, 53 Vout, 450W Series
Isolated, up to 450 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.
The system includes a precision low flow-rate anemometer, variable speed
fan, power supply input and load controls, temperature gauges, and adjustable
heating element.
The IR camera monitors the thermal performance of the Unit Under Test
(UUT) under static steady-state conditions. A special optical port is used which
is transparent to infrared wavelengths.
Heating
element
Precision
low-rate
anemometer
3” below UUT
Ambient
temperature
sensor
Both through-hole and surface mount converters are soldered down to a
10" x 10" 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 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 collimator reduces the amount of turbulence adjacent to the UUT by
minimizing airflow turbulence. Such turbulence influences the effective heat
transfer characteristics and gives false readings. Excess turbulence removes
more heat from some surfaces and less heat from others, possibly causing
uneven overheating.
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
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.
© 2015 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_PAH-48-53Vout-450W.A09 Page 19 of 19