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UCC256402: Loop gain equations for the UCC256402

Part Number: UCC256402
Other Parts Discussed in Thread: TL431, UCC25640EVM-020

I am missing the loop gain equations for the UCC256402, like whats the formula for Ires/Vfb? - there is a detailed design procedure in the datasheet, but it doesnt mention anything about loop gain?

like the components around the TL431 - how's the pole/zero selected?

best regards

Kim N Madsen