Dear team,
Customer is using UCC28180 design a BOOST PFC board.
However, the inductive on UCC28180 PCB is whistling when Vout=380VDC ,load is 400R. This is caused by loop instability.
The loop compensation component is all selected according to loop compensation guide in datasheet.
Can you help find what is the incorrect point with loop compensation ? And I will send the currently schematic to you by email.
Thank you & Best regards
Yunjing
