Hi Jim,
Thanks for the reply and no worries please take your time.
1. It would help if we can see some waveforms of the auxiliary winding and maybe change the snubber type to RC snubber will help to reduce the ringing due to increase in leakage inductance…
Philippe,
The datasheet indirectly discusses this by recommending to place the IC as close as possible to RSENSE and the external FET. Typically, traces to VCC and SENSE should be short and run side-by-side to maximize common-mode rejection. Kelvin connections…