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Yes, you can use the UCC28950 for primary side control withan opto coupler. You will just need to setup the voltage amplfier as a voltage follower by tying the COMP pin th EA-. You would then tie EA+ with a pull up resistor greater than 1K to Vref. Then you would tie the EA+ pin to the collector of the optocoupler and use the standard opto feedback network.
