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WEBENCH® Tools/UCC38C43: how to use it with out opto

Part Number: UCC38C43

Tool/software: WEBENCH® Design Tools

Hi,

i am using ucc38c43 ic for flyback circuit but i want to avoid isolation so i am trying to eliminate FOD817A and TL431AIDBZR so i thought of using FB pin by giving 2.5V through resistor divider and leave the comp pin open. will this work??