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UCC2897A: Need a extra chip to limit the power

Part Number: UCC2897A
Other Parts Discussed in Thread: LM5046, TPS40074, LM5045, LM5039, LM5025A

In the Control chip UCC2897A, we have cycle by cycle current limit. But this will vary with my input voltage range 80V-120V. I want to fix the maximum input power irrespective of the input voltage. How I can do that? Is there any limiting sense chip for that?