VIPer20A-E

Electrical over stress

21/34

6

Electrical over stress

6.1

Electrical over stress ruggedness

The VIPer may be submitted to electrical over-stress, caused by violent input voltage surges or

lightning. Following the Layout Considerations is sufficient to prevent catastrophic damages

most of the time. However in some cases, the voltage surges coupled through the transformer

implemented to improve the application immunity to such surges.

Figure 23. Input voltage surges protection

C1

Bulk capacitor

D1

R1

(Optional)

C2

22nF

Auxilliary winding

13V

OSC

COMP SOURCE

DRAIN

VDD

-

+

VIPerXX0

R2

39R