ST AN2001 Application note

AN2001

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						Product(s)
	●	Blue Angel compliant
	●	75% efficiency
	● Output short circuit and overload protection
	●	Thermal shutdown protection
	● Meets EN55022 class B EMI specification
	Operating conditions				Obsolete
			Parameter					Limits
			Input voltage range					90 to 264Vac
			Input Frequency	-				100kHz
			Output voltage					V=12V
		Product(s)Output ripple voltage						15mVpp
			Output power					24W
			Effi ien y					75% typical
			Line regulation					+/- 0
			Load regulation					+/- 0.2%
Obsolete			EMI				EN55022 Class B

September 2006

Rev 2

1/19

www.st.com

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 . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . .	Product(s). . . . . . . . . . . . . . . . . .	11
8	Blue Angel . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . .		12
9	EMI results			13
		. . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . .
10	Transformer specification .	. . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . .	14
11	Different output current and voltage capability		. . . . . . . . . . . . . . . . . .	15
		Obsolete
	-
12	Revision history . . . . . . . . .	. . . . . . . . . . . . . . . .	. . . . . . . . . . . . . . . . . .	18
	Product(s)
Obsolete

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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.	Vds and drain current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
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

Product(s) -Obsolete

Product(s) Obsolete

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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

Product(s) -Obsolete

Product(s) Obsolete

4/19

AN2001	PCB lay-out

1 PCB lay-out

Figure 1. Board layout (not in scale)

Product(s) -Obsolete

Product(s) Obsolete

5/19

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%						81.00%
Efficiency (%)	80%						80.50%
	70%
						Efficiency (%)	80.00%
	60%
							79.50%
	50%
							79.00%
	40%
							78.50%
	30%
							78.00%
	20%
							77.50%
	10%
	0%						77.00%
	0	0.5	1	1.5	2		80	130	180	230	280
	Efficiency		Iout (A)				Efficiency		Vin (Vac)
								Product(s)
					Obsolete
					-
		Product(s)
Obsolete
6/19