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UCC24624: Timing mistake when very low frequency noise enters the AC input

Part Number: UCC24624

Hi all,

My customer observed UCC24624 ON timing mistake.

When very low frequency noise enters the AC input, it happens.

He said, another competitor's SR IC is OK, no problem.

Can you image the problem?

He is using mass production board  and he changed IC to UCC24624.

And another problem also.

It is less efficient than competitors' SR ICs.

Why ?   I need some advice.