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UCC28064A: UCC28064A AC-Line Dropout

Part Number: UCC28064A

Hi there,

500W Power supply, using PFC IC UCC28064A and LLC topology.

The IC specification figure 29. on page 30. shows which VINAC rises above 0.71V then VSENSE rises as well.

In my codition, after AC-line voltage fall to zero in 16ms, and AC-line voltage returns.

There is about 14ms delay which makes Bulk CAP. Voltage down to 284V then 48V output voltage restart.

The waveforms show in attachment.

Please help to fix this problem.

Thanks.Voltage dip test waveform.pdfsluc645c-500W.xlsx