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Ucc2897A - active clamp FET running v hot.

steve ritchie
Prodigy 60 points
Other Parts Discussed in Thread: UCC2897

Hi - I am using the UCC2897 in a flyback design with an active clamp to eliminate ringing, but P  ch FET is getting v hot.

Please see attached drawing, which represents the circuit external to UCC2897.

The edges on the switching are <100ns, switching frequency 250KHz, with a PchFET capable of 250V and 13A. I'm at max 150V and around 1A. Looking for any suggestions as to why FET so hot.

cheers

steve