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UCC28070-Q1: PWM shutdown control logic during AC Vin drop

Part Number: UCC28070-Q1

Hi,

We found that PWM GDA/GDB shut down after AC Vin drop for a while, but the Vsense voltage should be higher than 0.75V at that point. Not sure if Vinac or others can cause PWM shut down. Please advise the PWM on/off control logic during AC input drop and recovery. Thanks.