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UCC28070: PF reduce when UCC28070 works in city electricity comparing with AC source

Part Number: UCC28070

Hi

UCC28070 Implement Bridgeless PFC Pre-Regulator in the circuit.

Cpmparing with AC source, the PF decrease obviously when the input is city electricity.

Can you figure out the reason about this issue?

And how can we optimize the shcematic?

TKS~