my coustomer would like to built a DC 110Vin to 12Vout/5A flyback with LT8316
however, the feedback function of all of the reference design in the datasheet and also EVB are based on a 3rd winding topology
since my customer already has a 8:1 transformer from legacy projects with similar power handling capability
he would like to use it as a common part and avoid adding a 3rd winding for the application now.
so my question is that is it possible that I use a isolated OP like ADUM3190 (or just photocoupler with 431) to implement feedback (OP out connect to VC) and freq compensation function
on the other hand, use a two stage LDO to built Vbias ?(110->55V-->12V)
it would make the whole topology look like traditional flyback and may also cost a lot than a 3rd winding, but that is my customer asking for.....
I'd think it might be possible but during startup, the added circuit shouldn't draw current from the INTVCC pin. Otherwise, the LT8316 won't switch as the INTVCC voltage cannot reach ~12V (UVLO rising threshold).