AN1344

General circuit description

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Figure 5.

Voltage and current waveforms

Figure 5 illustrates the voltage drain to source, and the current through the VIPer100A-E.

measured 609 V out of the 700 V, specified maximum. The current shows the power supply

being in continuous conduction mode with a peak of 2 A. The snubber R3-C4 reduces

ringing thus lowering the maximum peak voltage on the Power MOSFET and reducing the

EMI. In these waveforms the transil, D3, was replaced by an RC clamp, (R2=39 K, 2 W and

C3=4700 pF). The clamp circuit worked the same under normal operation, but during start

up or during short circuit operation, the voltage on the drain of VIPer100A-E reached as high

as 750 V. The device is avalanche rugged and was able to withstand the momentary energy.

Using the Transil at this power level is preferred in order to reduce the stresses.

Table 3.

Component list

Quantity

Reference

Value

Part number

1

BR1

600 V, 1.5 A

Bridge 2KBP06M

2

C1, C17

0.1 µF, X CAP

P4610

2

C2, C20

330 µF, 200 V

P6116

1

C4

100 pF, 1 KV

P4116

1

C5

180 µF, 16 V

P10245

1

C6

4.7 nF, 50 V

P4793

1

C7

22 nF, 50 V

P4517

1

C8

1 µF, 50 V

P10312

1

C9

1800 µF, 25 V

PANASONIC FC

1

C10

1800 µF, 25 V

P10283

1

C11

470 µF, 25 V

P6242C

2

C12, C15

0.1 µF, 50 V

P4923

1

C14

2.2 nF, Y1 CAP

P10463