PXA15xxSxx
Single Output 15 Watt DC-DC Converters
The PXA15 series is approved to UL/CSA/EN/IEC 60950-1.
Table of contents
Absolute Maximum Rating
Output Specification
Input Specification
General Specification
Characteristic Curves
Thermal Consideration
Short Circuit Protection
Output Over Current Protection
EMC Consideration
External Trim Adjustment
P2
P2
P3
P3
P4
P12
P12
P12
P13
P15
Remove ON/OFF Control
Test Configurations
Mechanical Data
Recommended Pad Layout
Soldering and Reflow Considerations
Clearing and Drying Considerations
Packaging Information
Part Number Structure
Safety and Installation Instruction
MTBF and Reliability
P16
P17
P18
P19
P20
P21
P22
P23
P23
P23
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
ABSOLUTE MAXIMUM RATINGS
Parameter
Device
Min
Input Surge Voltage(100mS max)
24Sxx
-0.3
48Sxx
-0.3
Operating Ambient Temperature
All
-40
Storage Temperature
All
-55
I/O Isolation Voltage
All
2250
Parameter
Operating Output Range
OUTPUT SPECIFICATIONS
Device
Min
xxS3P3
3.267
xxS05
4.95
xxS12
11.88
xxS15
14.85
All
-10
Voltage Adjustability (Note 1)
Output Regulation
Line (LL to HL at Full Load)
Load(0% to 100% of Full Load)
Output Ripple & Noise (Note 2)
(Measured with a 1uF M/C and a 10uF T/C at 20MHz
bandwidth )
Temperature Coefficient
Output Voltage Overshoot
Transient Response Recovery Time
(50% to 75% to 50% load change, ΔIo/Δt=0.1A/us)
Output Current
Output Over Voltage Protection
(Control voltage clamp)
Output Over Current Protection
Output Capacitor Load
Typ
Max
50
100
85
125
Unit
Vdc
Vdc
ºC
ºC
Vdc
Max
3.333
5.05
12.12
15.15
+10
Unit
Vdc
Vdc
Vdc
Vdc
%
All
All
0.2
0.2
%
%
S3P3,S05
S12,S15
75
100
mVp-p
+0.02
3
%/ ºC
%
All
All
-0.02
All
xxS3P3
xxS05
xxS12
xxS15
xxS3P3
xxS05
xxS12
xxS15
xxS3P3
xxS05
xxS12
xxS15
xxS3P3
xxS05
xxS12
xxS15
Typ
3.3
5
12
15
μs
300
0
0
0
0
3.7
5.6
13.5
16.8
3.85
3.3
1.375
1.1
4.375
3.75
1.56
1.25
3.5
3.0
1.25
1.0
5.4
7.0
19.6
20.5
4.9
4.2
1.75
1.4
1000
1000
330
220
A
A
A
A
Vdc
Vdc
Vdc
Vdc
A
A
A
A
μF
μF
μF
μF
2
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
INPUT SPECIFICATIONS
Parameter
Device
Min
Operating Input Voltage
24Sxx
18
48Sxx
36
Under Voltage Lockout Turn-on Threshold
24Sxx
48Sxx
Under Voltage Lockout Turn-off Threshold
24Sxx
48Sxx
Input reflected ripple current (Note 2)
All
Start Up Time
Power Up
All
Remote ON/OFF
All
Typ
24
48
17
33
14.5
30.5
30
Max
36
75
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
mAp-p
30
30
ms
ms
1.2
15
15
1.2
Vdc
Vdc
Vdc
Vdc
Max
1000
270
470
Unit
%
%
%
%
%
%
%
%
MΩ
pF
KHz
KHz
300
μs
10.5
6
2.2×10
g
hours
(Test at Vin = Vin(nom) and constant resistive load)
Remote ON/OFF (Note 3)
Negative Logic
DC-DC ON(Short)
DC-DC OFF(Open)
Positive Logic
DC-DC ON(Open)
DC-DC OFF(Short)
All
All
All
All
-0.7
3
3
-0.7
GENERAL SPECIFICATIONS
Parameter
Device
Min
Efficiency (Note 2)
24S3P3
(Test at Vin = Vin(nom) and full load)
24S05
24S12
24S15
48S3P3
48S05
48S12
48S15
Isolation resistance
All
10
Isolation Capacitance
All
Switching Frequency
S3P3,S05
(Test at Vin = Vin(nom) and full load)
S12,S15
Transient Response Recovery Time
All
(50% to 75% to 50% load change, ΔIo/Δt=0.1A/us)
Weight
MTBF (Note 4)
Note 1: Please see the external trim adjustment.
Note 2: Please see the testing configurations part.
Note 3: Please see the remote ON/OFF control part.
Note 4: Please see the MTBF and reliability part.
All
All
Typ
86
87
87
88
85
87
87
88
3
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-24S3P3 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
87
86.5
85
Efficiency (%)
86
Efficiency (%)
80
75
36Vin
24Vin
18Vin
70
65
85.5
85
84.5
84
83.5
60
83
350
700
1050
1400
1750
2100
2450
2800
3150
3500
18
20
22
24
26
28
30
32
34
36
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
4.00
Output Current (A)
3.50
3.00
2.50
2.00
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
1.50
1.00
0.50
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise Characteristic
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise
Characteristic
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
4
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-24S05 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
87
86.5
85
Efficiency (%)
Efficiency (%)
86
80
36Vin
24Vin
18Vin
75
70
85.5
85
84.5
84
65
83.5
60
83
300
600
900
1200
1500
1800
2100
2400
2700
3000
18
20
22
24
26
28
30
32
34
36
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
3.50
Output Current (A)
3.00
2.50
2.00
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
1.50
1.00
0.50
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
5
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-24S12 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
87
86.5
85
Efficiency (%)
Efficiency (%)
86
80
36Vin
24Vin
18Vin
75
70
85.5
85
84.5
84
65
83.5
83
60
125
250
375
500
625
750
875
1000
1125
18
1250
20
22
24
26
28
30
32
34
36
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
1.40
1.20
Output Current (A)
1.00
0.80
0.60
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
0.40
0.20
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
6
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-24S15 Characteristic Curves
90
88
85
87.5
Efficiency (%)
Efficiency (%)
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
80
36Vin
24Vin
18Vin
75
70
87
86.5
86
85.5
65
85
60
100
200
300
400
500
600
700
800
900
18
1000
20
22
24
26
28
30
32
34
36
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
1.20
Output Current (A)
1.00
0.80
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
0.60
0.40
0.20
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise C
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
7
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-48S3P3 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
86
85
85.5
85
Efficiency (%)
Efficiency (%)
80
75
70
75Vin
48Vin
36Vin
65
60
55
84.5
84
83.5
83
82.5
82
50
350
700
1050
1400
1750
2100
2450
2800
3150
36
3500
40
44
48
52
56
60
64
68
75
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
4.00
Output Current (A)
3.50
3.00
2.50
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
2.00
1.50
1.00
0.50
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise Ch
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
8
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-48S05 Characteristic Curves
90
90
85
89
80
88
Efficiency (%)
Efficiency (%)
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
75
70
75Vin
48Vin
36Vin
65
60
87
86
85
84
55
83
50
300
600
900
1200
1500
1800
2100
2400
2700
3000
82
36
40
44
48
52
56
60
64
68
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
75
3.50
3.00
Output Current (A)
2.50
2.00
1.50
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
1.00
0.50
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Derating Output Current versus Ambient
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Temperature and Airflow
Typical Output Ripple and Noise.
Vin=Vin,nom, Io=Full Load
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Typical Input Start-Up and Output Rise Characteristic
Using ON/OFF Voltage Start-Up and Output Rise
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
9
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-48S12 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
88
85
87.5
75
75Vin
48Vin
36Vin
70
65
60
87
Efficiency (%)
Efficiency (%)
80
86.5
86
85.5
85
55
84.5
84
50
125
250
375
500
625
750
875
1000
1125
1250
36
40
44
48
52
56
60
64
68
75
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
Output Current (A)
1.40
1.20
1.00
0.80
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
0.60
0.40
0.20
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
10
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
PXA15-48S15 Characteristic Curves
All test conditions are at 25 ºC.The figures are identical for either option suffix part numbers:
90
90
89.5
85
89
Efficiency (%)
Efficiency (%)
80
75
75Vin
48Vin
36Vin
70
65
60
88.5
88
87.5
87
86.5
86
55
85.5
85
50
100
200
300
400
500
600
700
800
900
1000
36
40
44
48
52
56
60
64
68
Output Current , Iout (mA)
Input Voltage , Vin (V)
Efficiency versus Output Current
Efficiency versus Input Voltage. Io=Full Load
75
1.20
1.00
Output Current (A)
0.80
0.60
Nature convection
1.0m/s(200LFM)
2.0m/s(400LFM)
3.0m/s(600LFM)
0.40
0.20
0.00
-40
-20
0
20
40
60
80
100
Ambient Temperature , Ta (ºC)
Conducted Emission of EN55022 Class B
Temperature and Airflow
Vin=Vin,nom, Io=Full Load
Output
voltage
Output Voltage
Input
Voltage
Derating Output Current versus Ambient
Typical Input Start-Up and Output Rise Characteristic
Typical Output Ripple and Noise.
Output
voltage
Output
voltage
ON/OFF
Voltage
Output
Current
Vin=Vin,nom, Io=Full Load
Using ON/OFF Voltage Start-Up and Output Rise
Transient Response to Dynamic Load Change from
75% to 50% to 75% of Full Load
11
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Thermal Consideration
The power module 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, convention, and radiation to the surrounding environment. Proper cooling
can be verified by measuring the point as the figure below. The temperature at this location should not exceed 120 ºC. When
Operating, adequate cooling must be provided to maintain the test point temperature at or below 120 ºC.Although the maximum point
temperature of the power modules is 120 ºC, maintaining a lower operating temperature will increase the reliability of this
device.
Temperature Measure Point
Short Circuit Protection
Continuous, hiccup and auto-recovery mode.
During a short circuit condition the converter will shut down. The average current during this condition will be very low and damage to
this device should not occur.
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 110~140 percent of rated current for PXA15 series.
Hiccup-mode is a method of operation in a power supply whose purpose is to protect the power supply from being damaged
during an over-current fault condition. It also enables the power supply to restart when the fault is removed. There are other ways of
protecting the power supply 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 those devices may exceed their specified limits.A protection mechanism has to be used to
prevent those 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 power
supply for a given time and then tries to start up the power supply again. If the over-load condition has been removed, the power supply
will start up and operate normally; otherwise, the controller will see another over-current event and shut off the power supply 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.
The hiccup operation can be done in various ways. For example, one can start hiccup operation any time an over-current event is
detected; or prohibit hiccup during a designated start-up interval (usually a few milliseconds). The reason for the latter operation is that
during start-up, the power supply needs to provide extra current to charge up the output capacitor. Thus the current demand during
start-up is usually larger than during normal operation and it is easier for an over-current event to occur. During start-up, if the power
supply starts to hiccup when there is an over-current, it might never start up successfully. Hiccup mode protection will give the best
protection for a power supply against over current situations, since it will limit the average current to the load at a low level, so reducing
power dissipation and case temperature in the power devices.
12
Data Sheet
JUN. 06, 2011
15W 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:
Component
Value
L1
10μH
C1
C2 & C3
6.8μF
470pF
Component
Value
L1
18μH
C1
C2 & C3
2.2μF
470pF
PXA15-24Sxx
Voltage
Reference
1.4A 0.1Ω 0504 SMD Inductor
---50V
1812 MLCC
3KV
1808 MLCC
PXA15-48Sxx
Voltage
Reference
1.2A 0.15Ω 0504 SMD Inductor
---100V
3KV
1812 MLCC
1808 MLCC
13
Data Sheet
JUN. 06, 2011
15W 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:
Component
C1 & C2
C3
C4 & C5
L1
L2
Component
C1 & C2
C3
C4 & C5
L1
L2
Value
6.8μF
6.8μF
470pF
145uH
10μH
Value
2.2μF
2.2μF
470pF
145uH
18μH
PXA15-24Sxx
Voltage
Reference
50V
1812 MLCC
50V
1812 MLCC
3KV
1808 MLCC
---Common Choke
1.44A 0.1Ω 0504 SMD Inductor
---PXA15-48Sxx
Voltage
Reference
100V
1812 MLCC
100V
1812 MLCC
3KV
1808 MLCC
---Common Choke
1.2A 0.15Ω 0504 SMD Inductor
----
14
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
External trim 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 +Vout or -Vout pins. With an external resistor
between the TRIM and +Vout pin, the output voltage set point decreases. With an external resistor between the TRIM and -Vout pin,
the output voltage set point increases.
Trim up equation
GL
RU
H
(
Vo
,
up
L
K
)
Trim down equation
(Vo , down L ) G
RD
H
(
Vo
Vo
,
down
)
Trim constants
Module
G
H
K
L
PXA15-××S15
10000
5110
12.5
2.5
PXA15-××S12
10000
5110
9.5
2.5
PXA15-××S05
5110
2050
2.5
2.5
PXA15-××S3P3
5110
2050
0.8
2.5
RU & RD List (Unit : KΩ)
RU trim up
%of Vo
+1%
+2%
+3%
+4%
+5%
+6%
+7%
+8%
+9%
+10%
xxS15
161.557
78.223
50.446
36.557
28.223
22.668
18.700
15.723
13.409
11.557
xxS12
203.223
99.057
64.334
46.973
36.557
29.612
24.652
20.932
18.038
15.723
xxS05
253.450
125.700
83.117
61.825
49.050
40.533
34.450
29.888
26.339
23.500
xxS3P3
385.071
191.511
126.990
94.730
75.374
62.470
53.253
46.340
40.963
36.662
RD trim down
%of Vo
-1%
-2%
-3%
-4%
-5%
-6%
-7%
-8%
-9%
-10%
xxS15
818.223
401.557
262.668
193.223
151.557
123.779
103.938
89.057
77.483
68.223
xxS12
776.557
380.723
248.779
182.807
143.223
116.834
97.985
83.848
72.853
64.057
xxS05
248.340
120.590
78.007
56.715
43.940
35.423
29.340
24.778
21.229
18.390
xxS3P3
116.719
54.779
34.133
23.810
17.616
13.486
10.537
8.325
6.604
5.228
15
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Remote ON/OFF Control
The Remote ON/OFF Pin is used to turn the DC/DC power module on and off. The user must connect a switch
between the on/off pin and the Vi (-) pin. The switch can be open collector transistor, FET, or Photo-Coupler. The
switch must be capable of sinking up to 1 mA at low logic level voltage. When using a high logic level, the maximum
signal voltage is 15V and the maximum allowable leakage current of the switch is 50 uA.
Remote ON/OFF Implementation Circuits
Isolated-Closure Remote ON/OFF
Level Control Using TTL Output
Level Control Using Line Voltage
There are two remote control options available, positive logic and negative logic.
a. Positive logic - The DC/DC module is turned on when the ON/OFF pin is at a high logic level. A low logic signal is
needed to turn off the device.
When PXA15 module is turned off at When PXA15 module is turned on at
Low logic level
High logic level
b. Negative logic – The DC/DC module is turned on when the ON/OFF pin is at low logic level. A high logic level signal
is needed to turn off the device.
When PXA15 module is turned on at When PXA15 module is turned off at
Low logic level
High logic level
16
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Testing Configurations
Input reflected-ripple current measurement
Peak-to-peak output ripple & noise measurement
Output voltage and efficiency measurement
Note:All measurements are taken at the module terminals.
Vout Iout
Efficiency
100%
Vin Iin
17
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Mechanical Data
max
m ax
(0.6)
m in stand-off
height
0.09(2.3)
SM D TYPE
0.03
(0.75)
DIP TYPE
SEC TION A-A
0.02(0.5)
B-B
A
0.02(0.5) max
A
0.05(1.3)typ
com pliance
m ax
EXTERNAL OUTPUT TRIMMING
Output can be externally trimmed by using the
method shown below.
TRIM UP
TRIM DOWN
5
RU
5
RD
4
0.94(23.88)
0.4(10.16)
0.30(7.62)
1.All dimensions in inches(mm)
2.Tolerance : x.xx±0.02(x.x±0.5)
x.xxx±0.010(x.xx±0.25)
3.Pin pitch tolerance ±0.014(0.35)
6
0.80(20.32)
0.50(12.7)
0.07(1.78)
0.94(23.88)
0.4(10.16)
0.80(20.32)
0.50(12.7)
0.30(7.62)
0.07(1.78)
SEC TIO N B-B
PIN CONNECTION
PIN
PXA15 SERIES
1
2
3
4
5
6
+ INPUT
- INPUT
ON/OFF
+VOUT
TRIM
-VOUT
PRODUCT STANDARD TABLE
Option
Negative remote ON/OFF with DIP
Negative remote ON/OFF with SMT
Positive remote ON/OFF with DIP
Positive remote ON/OFF with SMT
DIP type without ON/OFF pin
SMT type without ON/OFF pin
DIP type,negative remote ON/OFF without TRIM pin
SMT type,negative remote ON/OFF without TRIM pin
DIP type without ON/OFF&TRIM pin
SMT type without ON/OFF&TRIM pin
DIP type,positive remote ON/OFF without TRIM pin
SMT type,positive remote ON/OFF without TRIM pin
Suffix
-A
-B
-C
-D
-E
-F
-G
-H
-I
-J
-K
18
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Recommended Pad Layout
Recommended pad layout for DIP type
Recommended pad layout for SMD type
19
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Soldering and Reflow Considerations
Lead free wave solder profile for DIP type
Zone
Preheat zone
Actual heating
Reference Parameter.
Rise temp. speed: 3 ºC /sec max.
Preheat temp.100~130 ºC
Peak temp. :250~260 ºC
Peak time(T1+T2 time):4~6 sec
Lead free reflow profile for SMD type
Zone
Preheat zone
Actual heating
Cooling
Reference Parameter.
Rise temp. speed:1~3 ºC /sec
Preheat time:60~90sec
Preheat temp.155~185 ºC
Rise temp. speed:1~3 ºC /sec
Melting time:20~40 sec Melting temp:220 ºC
Peak temp. :230~240v
Peak time:10~20 sec
Rise temp. speed: -1~-5 ºC /sec
20
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Clearing and Drying Considerations
Cleaning process
a. PWB cooling prior to cleaning:
Power modules and their associated application PWB assemblies should not be cleaned after
soldering until the power modules have had an opportunity to cool to within the cleaning solution
temperature. This will prevent vacuum absorption of the cleaning liquid into the module between the pins
and the potting during cooling.
b. Cleaning process:
In aqueous cleaning, it is preferred to have an in-line system consisting of several cleaning stages
(prewash, wash, rinse, final rinse, and drying). De-ionized (DI) water is recommended for aqueous
cleaning; the minimum resistivity level is 1MΩ-cm. Tap-water quality varies per region in terms of
hardness, chloride, and solid contents; therefore, the use of tap water is not recommended for aqueous
cleaning. The total time of ultrasonic wave shall be less than 3 minutes.
Drying
After cleaning, dry converters at 100 ºC, more than 10minutes to assure that the moisture and other
potential foreign contaminants are driven out. For open power module construction with having
transformers and inductors that have unspotted windings, a baking process of 100 ºC for 30 min. is
recommended for the assembly to ensure that the moisture and other potential foreign contaminants are
driven out from the open windings.
The drying section of the cleaning system should be equipped with blowers capable of generating
1000 cfm-1500 cfm of air so that the amount of rinse water left to be dried off with heat is minimal.
Handheld air guns are not recommended due to the variability and inconsistency of the operation.
Product Post-wash external appearance
The marking or date-code may fade or disappear after cleaning.
21
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Packaging Information
Packaging information for DIP type
Packaging information for SMD type
22
Data Sheet
JUN. 06, 2011
15W SINGLE OUTPUT
Part Number Structure
PXA 15 – 24 S 05 -A
Total Output power
15 Watt
Option Suffix
Input Voltage Range
24xxx : 18~36V
48xxx : 36~75V
Single Output
Output Voltage
3P3 : 3.3V
05 : 5V
Safety and Installation Instruction
Isolation consideration
The PXA15 series features 2250 Volt DC isolation from input to output. The input to output resistance is greater than 10 megohms.
Nevertheless, if the system using the power module needs to receive safety agency approval, certain rules must be followed in the
design of the system using the model. In particular, all of the creepage and clearance requirements of the end-use safety requirement
must be observed. These documents include UL60950-1, EN60950-1 and CSA 22.2-960, although specific applications may have
other or additional requirements.
Fusing Consideration
Caution: This power module is not internally fused.An input line fuse must always be used.
This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone operation to an
integrated part of 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 normal-blow fuse with maximum
rating of 2A. 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 PXA15 series of DC/DC converters has been calculated using
Bellcore TR-NWT-000332 Case I: 50% stress, Operating Temperature at 40 ºC (Ground fixed and controlled environment)
The resulting figure for MTBF is 2.2× 106 hours.
23
