AN2063
Application note
VIPower™: low consumption standby power
with the VIPerx2A family
Introduction
The new regulation on the power supply standby consumption for the battery charger is
more and more stringent. Thanks to the VIPerx2A family low power consumption, a battery
charger can be built in standby mode with no-load of 100 mW. This charger solution with the
VIPer12A-E is presented in
Table 1.
Some general features:
•
•
•
•
•
•
Ultra low standby power dissipation
Burst mode operation in standby
72% typical efficiency
Current mode controller
Output short-circuit protection
Thermal shutdown protection
Table 1. Operation conditions
Parameters
Input voltage range
Input frequency range
Output voltage
Output current
Output power
Efficiency
Line regulation
Load regulation
Output ripple
Safety
90 to 264 VAC
50 to 60 Hz
5V
800 mA
4W
72% typical
0.5%
1%
30 mVpp
Short-circuit protection
Limits
November 2014
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Contents
AN2063
Contents
1
2
3
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Charger application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1
3.2
3.3
Schematic general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Solutions for energy saving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Performance results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
Input power consumption at no-load condition . . . . . . . . . . . . . . . . . . . . 7
Standby operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Load, line regulation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Load transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Switching waveforms of normal operation at full load . . . . . . . . . . . . . . 10
4
5
6
7
Transformer specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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AN2063
Description
1
Description
The VIPer12A-E is a high voltage integrated circuit intended to be used as a primary
side switch on the offline power supply, in a monolithic structure housed in DIP8 or SO-
8 package. It includes a PWM driver, a power MOSFET with 730 V breakdown voltage,
a start-up circuit and several protection circuits. It minimizes the count of external parts ,
reduces the product size and power consumption. This application note describes the
results obtained when the VIPer12A-E is used in mobile charger applications.
Figure 1. Evaluation board bottom foil (not in scale)
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General circuit description
AN2063
2
General circuit description
This board is a flyback regulator, delivering 0.8 A to 5 V. The AC input is rectified and filtered
by the diodes D1, D2, D3, D4, the bulk capacitor C1, and C2 to generate the high voltage
DC bus applied to the primary winding of the transformer, TR1. C1, L1, and C2 provide EMI
filtering for the circuit. D9 and D10 form the snubber circuit, which reduces the leakage
spike and voltage ringing on the drain pin of the VIPer12A-E.
The output voltage is regulated by a TL431 (U3) via an optocoupler (U2) to the feedback
pin. The output voltage ripple is controlled by the capacitor, C7, with an additional LC PI filter
configuration made up of L2 and C8. The output voltages can be modified by changing the
transformer turn ratio and modifying the R6 and R7 resistance values in the feedback loop.
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L1
680µ
D10
P6KE180
Option C
D9
STTH1L06
D8
1N5822
L2
4.7µ
D1
1N4007
D2
1N4007
C7
470µ
16V
C8
220µ
10V
DC
Option A
R0
10
C1
4.7µ
400V
D7
1N4148
C2
4.7µ
400V
Option E
D6
1N4148
R1
0
T1
Figure 2. Application schematic
DocID10955 Rev 2
U2
PC817
VDD
FB
DRAIN
R2
0
CONTROL
C5
33µ
50V
C6
10µ
33V
C4
47n
SOURCE
U1
VIPer12A
R3
220
Option B
R4
1.5k
U2
PC817
R7
43k
D3
1N4007
D4
1N4007
C10
100n
U3
TL431
C11
1n
1kV
Option E
R6
43k
General circuit description
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