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UCC256402: HV Startup

Part Number: UCC256402
Other Parts Discussed in Thread: UCC256404, TL431, UCC256403


I have two questions,

1- Verify that this is correct, or correct me if I'm wrong:
For UCC256402 or UCC256404, the datasheet doesn't specify a minimum high startup voltage (other than Vcc-startSelf = 26 V typ). So I assume if I don't use the diodes and connect DC voltage (45V) the controller will still startup normally, and after startup it doesn't consume power from HV pin anymore but it's powered from bias winding.

2- Is there an application note or help on how to implement feedback without the use of an optocoupler?

Example: output voltage --> feedback compensation circuit (with TL431 for example) --> unity amplifier --> maybe voltage to current --> feedback pin

Thanks for answering my questions