UCC28070: Improving Current Waveform Discontinuity

Hi Team,

My customer is evaluating the attached 1.5kW UCC28070 PFC design (design calculator spreadsheet) but they would like to eliminate the discontinuity in the current waveform below. They tried reducing the offset voltage in the current sense but it did not seem to help. 

Any ideas on how they can improve this?

Thanks,

Antonio

UCC28070 Design Tool _RevA 11Aug20.xls