PXD10-xxWSxx Single Output DC/DC Converter
9 to 36 Vdc and 18 to 75 Vdc input, 3.3 to 15 Vdc Single Output, 10W
Features
Single output current up to 2.5A
10 watts maximum output power
4:1 ultra wide input voltage range of 9-36 and 18-75VDC
Six-sided continuous shield
High efficiency up to 84%
Low profile: 2.001.000.40 inch (50.825.410.2 mm )
Fixed switching frequency
RoHS compliant
No minimum load
Input to output isolation: 1600Vdc,min
Operating case temperature range: 100°C max
Output over-voltage protection
Over-current protection, auto-recovery
Output short circuit protection
Options
Heat sinks available for extended operation
Remote on/off and logic configurations
Applications
Distributed power architectures
Computer equipment
Communications equipment
General Description
The PXD10-xxWSxx single output series offers 10 watts of output power from a 2 X 1 X 0.4 inch package. It
has 4:1 ultra wide input voltage of 9-36VDC, 18-75VDC,features 1600VDC of isolation, short circuit, over
voltage protection, and six sided shielding. All models are particularly suited to telecommunications,
industrial, mobile telecom and test equipment applications.
Table of Contents
Absolute Maximum Rating
Output Specification
Input Specification
General Specification
Characteristic Curves
Test Configurations
EMC Consideration
Input Source Impedance
Output Over Current Protection
Output Over Voltage Protection
Short Circuit Protection
P2
P2
P3
P4
P5
P21
P22
P24
P24
P24
P24
Thermal Considerations
Remote ON/OFF Control
Heat Sink
Mechanical Data
Recommended Pad Layout
Soldering Considerations
Packaging Information
Part Number Structure
Safety and Installation Instruction
MTBF and Reliability
P25
P26
P27
P27
P28
P28
P29
P29
P30
P30
DataSheet
10W, Single Output
Absolute Maximum Rating
Parameter
Model
Input Voltage
Continuous
Transient (100ms)
Operating Ambient Temperature (with derating)
Operating Case Temperature
Storage Temperature
Min
24WSxx
48WSxx
24WSxx
48WSxx
All
-40
All
-55
Max
Unit
36
75
50
100
85
100
105
VDC
°C
°C
°C
Output Specification
Parameter
Output Voltage Range
(Vin = Vin(nom); Full Load ; TA=25 °C)
Model
Min
Typ
Max
xxWS3P3
3.267
3.3
3.333
xxWS05
4.95
5
5.05
xxWS12
11.88
12
12.12
xxWS15
14.85
15
15.15
Unit
VDC
Output Regulation
Line (Vin(min) to Vin(max) at Full Load)
±0.2
All
Output Ripple & Noise
Peak -to- Peak (20MHz bandwidth)
Temperature Coefficient
Output Voltage Overshoot
(Vin(min) to Vin(max); Full Load ; TA=25°C)
%
±0.5
Load (0% to 100% of Full Load)
All
50
mVP-P
All
±0.02
%/°C
5
% VOUT
All
0
All
200
mV
All
250
μS
Dynamic Load Response
(Vin = Vin(nom); TA=25°C)
Load step change from
75% to 100% or 100 to 75% of Full Load
Peak Deviation
Setting Time (VOUT 10% peak deviation)
Output Current
Output Over Voltage Protection
(Zener diode clamp)
xxWS3P3
0
2500
xxWS05
0
2000
xxWS12
0
830
xxWS15
0
670
xxWS3P3
3.9
xxWS05
6.2
xxWS12
15
xxWS15
18
Output Over Current Protection
All
Output Short Circuit Protection
All
130
mA
VDC
150
% FL.
Hiccup, automatic recovery
VER:00 Page 2 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Input Specification
Parameter
Operating Input Voltage
Input Current
(Maximum value at Vin = Vin(nom); Full Load)
Input Standby Current
(Typical value at Vin = Vin(nom); No Load)
Input Reflected Ripple Current
(5 to 20MHz, 12μH source impedance)
Model
Min
Typ
Max
24WSxx
9
24
36
48WSxx
18
48
75
24WS3P3
465
24WS05
548
24WS12
519
24WS15
544
48WS3P3
239
48WS05
270
48WS12
259
48WS15
262
24WS3P3
Unit
Vdc
mA
13
24WS05
11
24WS12
16
24WS15
26
48WS3P3
10
48WS05
9
48WS12
9
48WS15
11
All
30
mA
mAP-P
Start Up Time
(Vin = Vin(nom) and constant resistive load)
All
Power up
mS
20
Remote On/Off Control (Option)
(The On/Off pin voltage is referenced to -VIN)
Positive logic
On/Off pin High Voltage (Remote On)
Suffix –P
3.5
12
On/Off pin Low Voltage (Remote Off)
Suffix –P
0
1.2
VDC
Negative logic
On/Off pin High Voltage (Remote On)
Suffix –N
0
1.2
On/Off pin Low Voltage (Remote Off)
Suffix –N
3.5
12
Remote Off Input Current
All
Input Current of Remote Control Pin
All
20
-0.5
mA
1
mA
VER:00 Page 3 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
General Specification
Parameter
Efficiency
(Vin = Vin(nom); Full Load ; TA=25°C)
Model
Min
Typ
24WS3P3
78
24WS05
80
24WS12
84
24WS15
81
48WS3P3
76
48WS05
81
48WS12
84
48WS15
84
Max
Unit
%
Isolation Voltage
Input to Output
All
Input to Case, Output to Case
VDC
1600
1600
Isolation Resistance
All
1
GΩ
Isolation Capacitance
All
Switching Frequency
All
300
kHz
Weight
All
27.0
g
All
1.976×10
300
pF
MTBF
Bellcore TR-NWT-000332, TC=40°C
MIL-HDBK-217F
6
hours
6
1.416×10
VER:00 Page 4 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves
All test conditions are at 25°C.The figures are for PXD10-24WS3P3
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 5 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS3P3
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 6 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves
All test conditions are at 25°C.The figures are for PXD10-24WS05
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 7 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS05
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 8 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS12
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 9 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS12
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 10 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS15
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 11 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-24WS15
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 12 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS3P3
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 13 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS3P3
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 14 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS05
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 15 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS05
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 16 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS12
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 17 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS12
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 18 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS15
Efficiency versus Output Current
Power Dissipation versus Output Current
Efficiency versus Input Voltage. Full Load
Derating OutputCurrentversus AmbientTemperature andAirflow
Vin = Vin(nom)
Derating OutputCurrentVersusAmbientTemperature with Heat-Sink
andAirflow ,Vin = Vin(nom)
VER:00 Page 19 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXD10-48WS15
Typical Output Ripple and Noise.
Transient Response to Dynamic Load Change from
Vin = Vin(nom) ; Full Load
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Vo Rise Characteristic
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
Conduction Emission of EN55022 Class A
Conduction Emission of EN55022 Class B
Vin = Vin(nom) ; Full Load
Vin = Vin(nom) ; Full Load
VER:00 Page 20 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Testing Configurations
Input reflected-ripple current measurement test:
Component
L
C
Value
12μH
100μF
Voltage
---100V
Reference
---Aluminum Electrolytic Capacitor
Peak-to-peak output ripple & noise measurement test
Output voltage and efficiency measurement test
Note: All measurements are taken at the module terminals.
V Io
Efficiency o
Vin I in
100%
VER:00 Page 21 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
EMC considerations
Suggested schematic for EN55022 conducted emission Class A limits
Recommended layout with input filter
To meet conducted emissions EN55022 CLASS A the following components are needed:
PXD10-24WSxx
Component
C1
C2, C3
PXD10-48WSxx
Component
C1
C2, C3
Value
1μF
1000pF
Voltage
50V
2KV
1210 MLCC
1808 MLCC
Reference
Value
1.5μF
1000pF
Voltage
100V
2KV
1812 MLCC
1808 MLCC
Reference
VER:00 Page 22 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
EMC considerations (Continued)
Suggested schematic for EN55022 conducted emission Class B limits
Recommended layout with input filter
To meet conducted emissions EN55022 CLASS B the following components are needed:
PXD10-24WSxx
Component
C1
C3, C4
L1
PXD10-48WSxx
Component
C1, C2
C3, C4
L1
Value
2.2μF
1000pF
325μH
Voltage
50V
2KV
----
Reference
1812 MLCC
1808 MLCC
Common Choke
Value
2.2μF
1000pF
325μH
Voltage
100V
2KV
----
Reference
1812 MLCC
1808 MLCC
Common Choke
Common Choke L1 is defined as follows:
■
L-325μH±35% / DCR-35mΩ, max
A height: 8.8 mm, Max
■ Test condition-100kHz / 100mV
■ Recommended through hole-Φ0.8mm
■ All dimensions in millimeters
VER:00 Page 23 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Input Source Impedance
The converter should be connected to a low impedance input source. Highly inductive source impedance can
affect the stability of the converter Input external L-C filter is recommended to minimize input reflected ripple current.
The inductor is a simulated source impedance of 12μH and the capacitor is Nippon chemi-con KY series 100μF/100V.
The capacitor must be located as close as possible to the input terminals of the converter for lowest impedance.
Output Over Current Protection
When excessive output currents occur in the system, circuit protection is required on all converters. Normally,
overload current is maintained at approximately 150 percent of rated current for PXF40-xxSxx series.
Hiccup-mode is a method of operation in a converter whose purpose is to protect the power supply from being
damaged during an over-current fault condition. It also enables the converter to restart when the fault is removed.
There are other ways of protecting the converter when it is over-loaded, such as the maximum current limiting or current
foldback methods.
One of the problems resulting from over current is that excessive heat may be generated in power devices;
especially MOSFET and Schottky diodes and the temperature of these devices may exceed their specified limits. A
protection mechanism has to be used to prevent these power devices from being damaged.
The operation of hiccup is as follows. When the current sense circuit sees an over-current event, the controller shuts
off the converter for a given time and then tries to start up the converter again. If the over-load condition has been
removed, the converter will start up and operate normally; otherwise, the controller will see another over-current event
and will shut off the converter again, repeating the previous cycle. Hiccup operation has none of the drawbacks of the
other two protection methods, although its circuit is more complicated because it requires a timing circuit. The excess
heat due to overload lasts for only a short duration in the hiccup cycle, hence the junction temperature of the power
devices is much lower.
Output Over Voltage Protection
The output over-voltage protection consists of an output Zener diode that monitors the voltage on the output
terminals. If the voltage on the output terminals exceeds the over-voltage protection threshold, then the Zener diode
clamps the output voltage.
Short Circuit Protection
Continuous, hiccup and auto-recovery mode.
VER:00 Page 24 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Thermal Consideration
The converter operates in a variety of thermal environments; however, sufficient cooling should be provided to help
ensure reliable operation of the unit. Heat is removed by conduction, convection, and radiation to the surrounding
environment. Proper cooling can be verified by measuring the point as shown in the figure below. The temperature at
this location should not exceed 100°C. When Operating, adequate cooling must be provided to maintain the test point
temperature at or below 100°C. Although the maximum point temperature of the power modules is 100°C, lowering
this temperature yields higher reliability.
Measurement shown in inches(mm)
TOP VIEW
VER:00 Page 25 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Remote ON/OFF Control (Option)
Remote control is an optional feature.
Positive logic:
Turns the module On during logic High on the On/Off pin and turns Off during logic Low.
Negative logic:
Turns the module On during logic Low on the On/Off pin and turns Off during logic High.
The On/Off pin is an open collector/drain logic input signal (Von/off) that referenced to -VIN.
Remote On/Off Implementation
Isolated-Control Remote On/Off
Level Control Using TTL Output
Level Control Using Line Voltage
VER:00 Page 26 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Heat Sink
Use heat-sink (7G-0020A) for lowering temperature and higher reliability of the module.
All dimensions in Inches (mm)
Mechanical Data
PIN
1
2
3
5
6
PIN CONNECTION
Function
+ INPUT
- INPUT
+ OUTPUT
- OUTPUT
CTRL (Option)
1.All dimensions in Inches (mm)
Tolerance:x.xx±0.02 (x.x±0.5)
x.xxx±0.01 (x.xx±0.25)
2. Pin pitch tolerance ±0.01(0.25)
3. Pin dimension tolerance ±0.014(0.35)
VER:00 Page 27 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Recommended Pad Layout
1.All dimensions in Inches (mm)
Tolerance:x.xx±0.02 (x.x±0.5)
x.xxx±0.01 (x.xx±0.25)
2. Pin pitch tolerance ±0.01(0.25)
Soldering Considerations
Lead free wave solder profile for PXD10-xxWSxx series.
Zone
Preheat zone
Reference Parameter
Rise temp. speed : 3°C / sec max.
Preheat temp. : 100~130°C
Actual heating
Peak temp. : 250~260°C
Peak time (T1+T2 time) : 4~6 sec
Reference Solder:Sn-Ag-Cu / Sn-Cu
Hand Welding: Soldering iron-Power 90W
Welding Time:2-4 sec
Temp.: 380-400 °C
VER:00 Page 28 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Packaging Information
All dimensions in millimeters
20 PCS per
Tube
Part Number Structure
PXD 10 – 48 WS 05 -P
Max. Output Power
10 Watts
Remote Control
Input Voltage Range
No Suffix: Without Remote Control
Suffix –P: Positive Logic
Suffix –N: Negative Logic
24 9 ~ 36V
48 18 ~ 75V
4:1 Ultra Wide Input Range
Output Voltage
Single Output
3P3
05
12
15
Model
Number
Input
Range
PXD10-24WS3P3
PXD10-24WS05
PXD10-24WS12
PXD10-24WS15
PXD10-48WS3P3
PXD10-48WS05
PXD10-48WS12
PXD10-48WS15
9 – 36 VDC
9 – 36 VDC
9 – 36 VDC
9 – 36 VDC
18 – 75 VDC
18 – 75 VDC
18 – 75 VDC
18 – 75 VDC
Output
Voltage
3.3VDC
5VDC
12VDC
15VDC
3.3VDC
5VDC
12VDC
15VDC
3.3VDC
5VDC
12VDC
15VDC
Output Current
Max. Load
2500mA
2000mA
830mA
670mA
2500mA
2000mA
830mA
670mA
Input Current
(1)
Full Load
465mA
548mA
519mA
544mA
239mA
270mA
259mA
262mA
(2)
Eff
(%)
78
80
84
81
76
81
84
84
Note 1. Maximum value at nominal input voltage and full load of standard type.
Note 2. Typical value at nominal input voltage and full load.
VER:00 Page 29 of 30 Issued Date：2009/03/02
DataSheet
10W, Single Output
Safety and Installation Instruction
Fusing Consideration
Caution: This converter is not internally fused. An input line fuse must always be used.
This encapsulated converter can be used in a wide variety of applications, ranging from simple stand-alone operation to
an integrated part of a sophisticated power architecture. For maximum flexibility, internal fusing is not included; however,
to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a
slow-blow fuse with maximum rating of 5A. Based on the information provided in this data sheet on Inrush energy and
maximum dc input current; the same type of fuse with lower rating can be used. Refer to the fuse manufacturer’s data
for further information.
MTBF and Reliability
The MTBF of PXD10-xxWSxx series of DC/DC converters has been calculated using
Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled
6
environment ). The resulting figure for MTBF is 1.976×10 hours.
MIL-HDBK 217F NOTICE2 FULL LOAD, Operating Temperature at 25℃°C. The resulting figure for MTBF is
6
1.416 × 10 hours.
VER:00 Page 30 of 30 Issued Date：2009/03/02
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