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UCC2897A: switching frequency

Part Number: UCC2897A

Hi

I use UCC2897A to design active clamp forward input 36~72V output 12V/10A.

But I found a problem about switching frequency.

I'd like it operation at 180kHz  but it only appears at no load or below 20W output.

When the output load increases over 20W,the switching frequency changes to 195kHz.

What it might be the root cause?