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Original question:

WEBENCH® Tools/UCC2813-3-Q1: IC not starting up

WEBENCH Tools/UCC2813-3-Q1: soft start vs slope compensation

Vijayaraghavan Madhuravasal
Prodigy 20 points
Part Number: UCC2813-3-Q1

Tool/software: WEBENCHRegistered Design Tools

Greetings

I am using UCC2813-3-Q1 for a simple forward converter. I find that the soft-start is not working. The first output pulse appears as COMP pin is around 1V. But the duty cycle is high. This IC comes with internal soft-start. I do not have anything external for soft-start. I also do not have any slope compensations since my application does not require above 45% duty. 

Is there a correlation between the slope compensation and the soft-start circuitry?


Thanks

Vijay