DocID025703 Rev 2

15/31

VIPER38

Operation

31

Equation 1

time represents an estimate of the user’s application according to the output stage

configurations (transformer, output capacitances, etc.).

During the converter startup time, the drain current limitation is progressively increased to

the maximum value. In this way the stress on the secondary diode is considerably reduced.

It also helps to prevent transformer saturation. The soft-start time lasts 8.5 ms and the

feature is implemented for every attempt of the startup converter or after a fault.

C

VDD

I

DDch1

t

SSaux

×

V

DDon

V

DDoff

–

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=