ST AN2001 Application note
AN2001
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Application note
VIPower: VIPer53 single output reference
board 90 to 264 VAC input, 24W output
Introduction
The VIPer53 combines an enhanced current mode PWM controller with a high voltage
MDMesh Power Mosfet in the same package. VIPer53 is available in two different
packages, DIP-8 and PowerSO-10. This reference board is an offline wide range power
supply that incorporates VIPer53 and is set up for secondary regulation by driving the PWM
controller through an optocoupler. The switching frequency is set at 100 kHz and the total
output power is 24W.
● Switch mode general purpose power supply
● Current mode control with adjustable limitation
● 75% efficiency
● Output short circuit and overload protection
● Thermal shutdown protection
● Meets EN55022 class B EMI specification
● Blue Angel compliant
Operating conditions
Parameter Limits
Input voltage range 90 to 264Vac
Input Frequency 100kHz
Output voltage V=12V
Output power 24W
Efficiency 75% typical
Line regulation +/- 0
Load regulation +/- 0.2%
Output ripple voltage 15mVpp
EMI EN55022 Class B
September 2006 Rev 2 1/19
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Contents AN2001
Contents
1 PCB lay-out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Line regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6 Line and switching frequency ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8 Blue Angel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 EMI results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10 Transformer specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
11 Different output current and voltage capability . . . . . . . . . . . . . . . . . . 15
12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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AN2001 List of figures
List of figures
Figure 1. Board layout (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Efficiency vs. Iout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Efficiency vs. Vin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Line regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Transient response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Line frequency ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Switching frequency ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. V
Figure 10. EMI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11. Transformer specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12. PC board top legend (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. PC board bottom copper (not in scale) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 14. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
and drain current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ds
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List of tables AN2001
List of tables
Table 1. Secondary component value to obtain different output voltage and current. . . . . . . . . . . . 15
Table 2. Component list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 3. Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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AN2001 PCB lay-out
1 PCB lay-out
Figure 1. Board layout (not in scale)
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Efficiency AN2001
2 Efficiency
Figure 2. and Figure 3. shows the two efficiency curves of the reference board. The
measurements on Figure 2. are taken at the input voltage of 120Vac while the output load is
varied from 0A to the full load of 2A. Meanwhile, Figure 3. shows the efficiency when the
input voltage is varied from 90 to 264Vac while the output load is fixed at 2A.
Figure 2. Efficiency vs. Iout Figure 3. Efficiency vs. Vin
90%
80%
70%
60%
50%
40%
30%
Efficiency (%)
20%
10%
0%
00.511.52
Efficiency
Iout (A)
81.00%
80.50%
80.00%
79.50%
79.00%
78.50%
Efficiency (%)
78.00%
77.50%
77.00%
Efficiency
80 130 180 230 280
Vin (Vac)
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