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Hi Ram
i already replied that my issue not resolve by replacing resistor value. Now i saw UCC-28630 Data sheet page 54 figure 44 application circuit used Zener diode at HV pin. May i use this type of zener to stable the voltage ?
Can you capture the VDD voltage through a scope and send me the image. I think the problem could be that the auxiliary is not able build up the voltage to sustain operation.
The UCC28630 started switching when VDD reaches 14V but it turn-off when VDD reached 12V. I believe that it detected some fault. Can you try to capture the Drive pin waveform along with the VDD. This can indicate to you if the IC stopped switching when VDD reaches 12.
