PXF40-xxDxx Dual Output DC/DC Converter
9 to 18 Vdc and 18 to 36 Vdc and 36 to 75 Vdc input, 3.3 to 15 Vdc Dual Output, 40W
Features
• Dual output current up to 8A
• 40 watts maximum output power
• 2:1 wide input voltage range
• Six-sided continuous shield
• High efficiency up to 89%
• Low profile: 2.00 x 2.00 x 0.40 inch (50.8 x 50.8 x 10.2 mm)
• Fixed switching frequency
• RoHS directive compliant
• Input to output isolation: 1600Vdc,min
• Over-temperature protection
• Input under-voltage protection
• Output over-voltage protection
• Over-current protection, auto-recovery
• Output short circuit protection, auto-recovery
• Remote ON/OFF
Options
• Heat sinks available for extended operation
APPLICATIONS
Wireless Network
Telecom/Datacom
Industry Control System
Measurement
Semiconductor Equipment
General Description
The PXF40-xxDxx series offers 40 watts of output power from a 2 x 2 x 0.4 inch package. This series has a 2:1
wide input voltage of 9-18VDC,18-36VDC or 36-75VDC and features 1600VDC of isolation, short-circuit and
over-voltage protection.
Table of Contents
Absolute Maximum Rating
Output Specification
Input Specification
General Specification
Characteristic Curves
Testing Configurations
EMC Considerations
Input Source Impedance
Output Over Current Protection
Output Over Voltage Protection
Short Circuit Protection
P2
P2
P3
P4
P5
P23
P24
P26
P26
P27
P27
Thermal Consideration
Heat Sink Consideration
Remote ON/OFF Control
Mechanical Data
Recommended Pad Layout
Output Voltage Adjustment
Soldering and Reflow Consideration
Packaging Information
Part Number Structure
Safety and Installation Instruction
MTBF and Reliability
P27
P28
P29
P30
P31
P32
P33
P34
P34
P35
P35
Jun. 20, 2011
40W, Dual Output
Absolute Maximum Rating
Parameter
Model
Input Voltage
Continuous
Transient (100ms)
Operating Ambient Temperature (with derating)
Operating Case Temperature
Storage Temperature
12Dxx
24Dxx
48Dxx
12Dxx
24Dxx
48Dxx
All
All
All
Min
Max
Unit
18
36
75
36
50
100
85
100
105
-40
-55
Vdc
°C
°C
°C
Output Specification
Parameter
Output Voltage
(Vin = Vin(nom) ; Full Load ; TA=25°C)
Voltage Adjustability
Model
xxD12
xxD15
Min
Typ
Max
11.88
12
12.12
14.85
15
3.3/5
15.15
Unit
Vdc
xxD3305
3.267/4.95
3.333/5.05
All
-10
+10
%
All
-0.5
+0.5
%
-1.0
+1.0
Output Regulation
Line (Vin(min) to Vin(max) at Full Load)
Load (Min. to 100% of Full Load)
Output Ripple & Noise
Peak-to-Peak (20MHz bandwidth)
(Measured with a 0.1μF/50V MLCC)
(Measured with a 1μF/50V MLCC)
Temperature Coefficient
Output Voltage Overshoot
(Vin(min) to Vin(max) ; Full Load ; TA=25°C)
xxD12
120
xxD15
150
xxD3305
All
mVp-p
100
-0.02
+0.02
%/°C
3
% Vo
All
0
All
250
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
(Any condition of dual output (3.3V/5V) rated Iout current, not
to exceed 8A of total output currents. The product safety
approval pending)
Output Over Voltage Protection
(Zener diode clamp)
xxD12
±144
±1800
xxD15
±112
±1400
mA
xxD3305
0
4/4
A
xxD12
15
xxD15
18
xxD3305
3.9/6.2
Output Over Current Protection
All
Output Short Circuit Protection
All
Vdc
150
% FL.
Hiccup, automatic recovery
VER:00 Page 2 of 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Input Specification
Parameter
Operating Input Voltage
Input Current
(Maximum value at Vin = Vin(nom); Full Load)
Model
Min
Typ
Max
12Dxx
9
12
18
24Dxx
18
24
36
48Dxx
36
48
(Typical value at Vin = Vin(nom); No Load)
Under Voltage Lockout Turn-on Threshold
Under Voltage Lockout Turn-off Threshold
Input Reflected Ripple Current
(5 to 20MHz, 12μH Source Impedance)
Vdc
75
12D12
4444
12D15
4321
12D3305
3416
24D12
2169
24D15
2108
24D3305
1689
48D12
1084
48D15
1054
48D3305
Input Standby Current
Unit
mA
823
12D12
30
12D15
35
12D3305
325
24D12
20
24D15
20
24D3305
80
48D12
15
48D15
15
48D3305
45
mA
12Dxx
9
24Dxx
17.8
48Dxx
36
12Dxx
8
24Dxx
16
48Dxx
34
All
40
Vdc
Vdc
mAp-p
Start Up Time
(Vin = Vin(nom) and Constant Resistive Load)
Power Up
All
25
Remote ON/OFF
25
Remote ON/OFF Control
Vdc
(The ON/OFF pin voltage is referenced to -VIN)
Positive Logic
DC-DC ON
mS
All
DC-DC OFF
Remote Off Input Current
All
Input Current of Remote Control Pin
All
3.5
12
0
1.2
2.5
-0.5
VER:00 Page 3 of 35
mA
0.5
mA
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
General Specification
Parameter
Efficiency
(Vin = Vin(nom) ; Full Load ; TA=25°C)
Model
Min
Typ
12D12
85
12D15
85
12D3305
85
24D12
87
24D15
87
24D3305
86
48D12
87
48D15
87
48D3305
88
Max
Unit
%
Isolation Voltage
Input to Output
All
Input to Case, Output to Case
All
Isolation Capacitance
All
Weight
GΩ
1
1000
pF
xxD12
xxD15
master (5Vo) 300kHz slave (3.3Vo) 500kHz
Vdc
1600
Isolation Resistance
Switching Frequency
1600
300
xxD3305
kHz
All
60
g
All
1.398×106
3.585×105
hours
All
115
°C
MTBF
Bellcore TR-NWT-000332, TC=40°C
MIL-HDBK-217F
Over Temperature Protection
VER:00 Page 4 of 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves
All test conditions are at 25°C.The figures are for PXF40-12D12
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 5 of 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-12D12
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 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-12D15
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 7 of 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-12D15
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 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-12D3305
Efficiency Versus Output Current
Power Dissipation Versus Output Current
Efficiency Versus Input Voltage. Full Load
Derating Output Current Versus Ambient Temperature and Airflow
Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 9 of 35
Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-12D3305
Typical Output Ripple and Noise.
Vin = Vin(nom), Full Load
+5Vo:
Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
+3.3Vo:Full load
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D12
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 11 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D12
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D15
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 13 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D15
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D3305
Efficiency Versus Output Current
Power Dissipation Versus Output Current
Efficiency Versus Input Voltage. Full Load
Derating Output Current Versus Ambient Temperature and Airflow
Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 15 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-24D3305
Typical Output Ripple and Noise.
Vin = Vin(nom), Full Load
+5Vo:
Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
+3.3Vo:Full load
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D12
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 17 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D12
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D15
Efficiency Versus Output Current
Efficiency Versus Input Voltage. Full Load
Power Dissipation Versus Output Current
Derating Output Current Versus Ambient Temperature and
Airflow Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 19 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D15
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 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D3305
Efficiency Versus Output Current
Power Dissipation Versus Output Current
Efficiency Versus Input Voltage. Full Load
Derating Output Current Versus Ambient Temperature and Airflow
Vin = Vin(nom)
Derating Output Current Versus Ambient Temperature with Heat-Sink
and Airflow ,Vin = Vin(nom)
VER:00 Page 21 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Characteristic Curves (Continued)
All test conditions are at 25°C.The figures are for PXF40-48D3305
Typical Output Ripple and Noise.
Vin = Vin(nom), Full Load
+5Vo:
Transient Response to Dynamic Load Change from
100% to 75% to 100% of Full Load ; Vin = Vin(nom)
+3.3Vo:Full load
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 22 of 35 Issued Date：2009/03/02
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40W, Dual Output
Test Configurations
Input reflected-ripple current measurement test:
Component
L
C
Value
12μH
220μF
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
× 100%
Efficiency = o
Vin × I in
VER:00 Page 23 of 35 Issued Date：2009/03/02
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40W, Dual Output
EMC Considerations
Suggested Schematic for EN55022 Conducted Emission Class A Limits
Recommended Layout with Input Filter
To meet conducted emissions EN55022 CLASS A needed the following components:
PXF40-12Dxx
Component
C1
C3, C4
Value
6.8uF
1000pF
Voltage
50V
2KV
1812 MLCC
1808 MLCC
PXF40-24Dxx
Component
C1
C3, C4
Value
6.8uF
1000pF
Voltage
50V
2KV
1812 MLCC
1808 MLCC
PXF40-48Dxx
Component
C1
C3, C4
Value
2.2uF
1000pF
Voltage
100V
2KV
1812 MLCC
1808 MLCC
Reference
Reference
Reference
VER:00 Page 24 of 35 Issued Date：2009/03/02
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40W, Dual 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 needed the following components:
PXF40-12Dxx
Component
C1, C3
C5, C6
L1
Value
4.7uF
1000pF
450uH
Voltage
50V
2KV
----
Reference
1812 MLCC
1808 MLCC
Common Choke
PXF40-24Dxx
Component
C1, C3
C5, C6
L1
Value
6.8uF
1000pF
450uH
Voltage
50V
2KV
----
Reference
1812 MLCC
1808 MLCC
Common Choke
PXF40-48Dxx
Component
C1, C2
C3, C4
C5, C6
L1
Value
2.2uF
2.2uF
1000pF
830uH
Voltage
100V
100V
2KV
----
Reference
1812 MLCC
1812 MLCC
1808 MLCC
Common Choke
VER:00 Page 25 of 35 Issued Date：2009/03/02
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40W, Dual Output
EMC Considerations (Continued)
Common Choke L1 is defined as follows:
■
L: 450μH±35% / DCR: 25mΩ, max
A height: 9.8 mm, Max
■
L-830μH±35% / DCR- 1mΩ, max
A height: 8.8 mm, Max
■ Test condition: 100KHz / 100mV
■ Recommended through hole: Φ0.8mm
■ All dimensions in millimeters
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 capacitor is Nippon chemi-con KY series 220μF/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 power supplies. Normally,
overload current is maintained at approximately 150 percent of rated current for PXF40-xxDxx 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.
VER:00 Page 26 of 35 Issued Date：2009/03/02
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40W, Dual Output
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 Circuitry Protection
Continuous, hiccup and auto-recovery mode.
During a short circuit the converter shuts down. The average current during this condition will be very low.
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 module is 100°C, limiting this
temperature to a lower value will increase the reliability of the unit.
VER:00 Page 27 of 35 Issued Date：2009/03/02
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40W, Dual Output
Heat Sink Consideration
Optional heat-sink (HAPXF) and optional heat sink clip (HAPXFCLIP); two clips required when used.
All dimensions in millimeters
VER:00 Page 28 of 35 Issued Date：2009/03/02
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40W, Dual Output
Remote ON/OFF Control
The Remote ON/OFF Pin is used to turn on and off the DC-DC converter. The user must use a switch to
control the logic voltage (high or low level ) of the ON /OFF pin, referenced to Vi (-). The switch can be a open collector
transistor, FET, or Opto-Coupler, that is capable of sinking up to 0.5 mA at a low-level logic Voltage. For high-level logic
of the ON/OFF signal (maximum voltage): the allowable leakage current of the switch at 12V is 0.5 mA.
Remote ON/OFF Implementation Circuits
Isolated-Control Remote ON/OFF
Level Control Using TTL Output
Level Control Using Line Voltage
Positive logic:
PXF40 module is turned off at
PXF40 module is turned on at
Low-level logic
High-level logic
VER:00 Page 29 of 35 Issued Date：2009/03/02
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40W, Dual Output
Mechanical Data
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 ±0.004 (0.1)
PIN
1
2
3
4
5
6
7
8
9
PIN CONNECTION
EXTERNAL OUTPUT TRIMMING
DUAL
+INPUT
-INPUT
CTRL
NO PIN
+OUTPUT
COMMON
COMMON
-OUTPUT
TRIM
Output can be externally trimmed by using
the method shown below.
DUAL POSITIVE
+INPUT
-INPUT
CTRL
3.3V
COMMON
NC
NC
5V
COMMON
TRIM UP
TRIM DOWN
8
9
RU
9
RD
5
VER:00 Page 30 of 35 Issued Date：2009/03/02
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40W, Dual Output
Recommended Pad Layout
TOP VIEW
1.All dimensions in Inches (mm)
Tolerance: X.XX±0.02 (X.X±0.5)
2. Pin pitch tolerance ±0.014(0.35)
VER:00 Page 31 of 35 Issued Date：2009/03/02
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40W, Dual Output
Output Voltage Adjustment
Output voltage set point adjustment allows the user to increase or decrease the output voltage set point of a
module. This is accomplished by connecting an external resistor between the TRIM pin and either the Vo(+) or Vo(-)
pins. With an external resistor between the TRIM and Vo(-) pin, the output voltage set point increases. With an external
resistor between the TRIM and Vo(+) pin, the output voltage set point decreases.
TRIM DOWN
TRIM UP
9
8
RU
RD
5
9
TRIM TABLE
PXF40-xxD12
Trim up (%)
1
2
3
4
5
6
7
8
9
10
VOUT (Volts)=
±12.12
±12.24
±12.36
±12.48
±12.6
±12.72
±12.84
±12.96
±13.08
±13.2
RU (K Ohms)=
218.21
98.105
58.07
38.052
26.042
18.035
12.316
8.026
4.69
2.021
Trim down (%)
1
2
3
4
5
6
7
8
9
10
VOUT (Volts)=
±11.88
±11.76
±11.64
±11.52
±11.4
±11.28
±11.16
±11.04
±10.92
±10.8
RD (K Ohms)=
273.44
123.02
72.874
47.803
32.76
22.732
15.568
10.196
6.017
2.675
PXF40-xxD15
Trim up (%)
1
2
3
4
5
6
7
8
9
10
VOUT (Volts)=
±15.15
±15.3
±15.45
±15.6
±15.75
±15.9
±16.05
±16.2
±16.35
±16.5
RU (K Ohms)=
268.29
120.64
71.429
46.822
32.058
22.215
15.184
9.911
5.81
2.529
Trim down (%)
1
2
3
4
5
6
7
8
9
10
VOUT (Volts)=
±14.85
±14.7
±14.55
±14.4
±14.25
±14.1
±13.95
±13.8
±13.65
±13.5
RD (K Ohms)=
337.71
152.02
90.126
59.178
40.609
28.23
19.387
12.756
7.598
3.471
VER:00 Page 32 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Soldering and Reflow Consideration
Lead free wave solder profile for PXF40-xxDxx DIP type
Zone
Reference Parameter
Preheat zone
Rise temp. speed : 3°C / sec max.
Actual heating
Peak temp. : 250~260°C
Preheat temp. : 100~130°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 33 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual Output
Packaging Information
10 PCS per TUBE
Part Number Structure
PXF 40 – 48 D 12
Max. Output Power
43.2Watts
Output Voltage
3.3／05 : 3.3／05 Vdc
12
: 12Vdc
15
: 15Vdc
Input Voltage Range
12 : 9 ~ 18V
24 : 18 ~ 36V
48 : 36 ~ 75V
Dual Output
Model
Number
Input
Range
Output
Voltage
Output Current
Input Current
Eff (4)
Min. load
Full load
No load (2) Full Load(3) (%)
PXF40-12D12
9 – 18 VDC
± 12 VDC
± 144mA
± 1800mA
30mA
4444mA
85
PXF40-12D15
9 – 18 VDC
± 15 VDC
± 112mA
± 1400mA
35mA
4321mA
85
PXF40-12D3305
9 – 18 VDC
3.3 / 5 VDC
0mA
3416mA
85
4A / 4A (total 8A) (1) 325mA
PXF40-24D12
18 – 36 VDC
± 12 VDC
± 144mA
± 1800mA
20mA
2169mA
87
PXF40-24D15
18 – 36 VDC
± 15 VDC
± 112mA
± 1400mA
20mA
2108mA
87
PXF40-24D3305
18 – 36 VDC
3.3 / 5 VDC
0mA
80mA
1689mA
86
4A / 4A (total 8A) (1)
PXF40-48D12
36 – 75 VDC
± 12 VDC
± 144mA
± 1800mA
15mA
1084mA
87
PXF40-48D15
36 – 75 VDC
± 15 VDC
± 112mA
± 1400mA
15mA
1054mA
87
PXF40-48D3305
36 – 75 VDC
3.3 / 5 VDC
0mA
45mA
823mA
88
4A / 4A (total 8A) (1)
Note 1. Any condition of dual output (3.3V/5V) rated Iout current, not to exceed 8A of total output currents. The product safety
approval pending.
Note 2. Typical value at nominal input voltage and no load.
Note 3. Maximum value at nominal input voltage and full load
Note 4. Typical value at nominal input voltage and full load.
VER:00 Page 34 of 35 Issued Date：2009/03/02
Jun. 20, 2011
40W, Dual 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. To 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 8A. 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 PXF40-xxDxx dual output DC/DC converters has been calculated using
Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40°C (Ground fixed and controlled
environment ). The resulting figure for MTBF is 1.398×106 hours.
MIL-HDBK-217F NOTICE2 FULL LOAD, Operating Temperature at 25°C ℃. The resulting figure for MTBF is
3.585×105 hours.
VER:00 Page 35 of 35 Issued Date：2009/03/02
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