Hi
Our customer are evaluating UCC27201 in secondry side of isolated application such as full bridge converter.
There is a abnormal phenomenon on customer's board. Please see following waveform.
It is repeating restart because the voltage of VDD is below UVLO during it is starting.
Condition : Vin=48V,Io=0A,Vo=12V VDD-VSS:1uF, HB-HS:0.1uF
How much capacitor does it need? It looks the input current is large.
Regards,
Koji Hamamoto