Hello,
According to the datasheet of UCC2871x, the start-up voltage on the VDD pin (VDDon) is 21V TYP and the current comes from the HV pin.
In my understanding, the HV pin needs at least 21V or more for charging the VDD capacitor in this case.
Please provide me the minimum HV pin DC voltage needed or the minimum difference voltage between the HV pin and VDD pin for a start-up operation.
Best regards,
Shintaro
