Hi,
I have designed a 1000W PFC using UCC28063. The input is 249Vac-450Vac and the output is 700V/1050W. I have two questions.
1. I've seen sometimes UCC28063 works in same phase not 180 out-of-phase;
2. As below left figure shows, the input is 366Vac, when the output is 323W, there is a strange current spike at Iac.(Blue curve is Iac; Red curve is Vac); But with higher power as 716W+, the spike disappears.(below right figure)
I've attached the SCH. Could pls give advice to find out the causes? Thanks.
