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feedback circuit in inverter

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--BawA--

--BawA--

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I have designed a dc dc converter i.e from 12vdc to 311vdc.which is regulated. I have used sg3525 .
The feedback is eshtablished using voltage divider resistive network at 311v side .
I want to use 4n35 optocoupler instead of directly using voltage divider network so as to isolate low voltage components from high voltage.i havn't used 4n35 ever .
Can anyone suggest me any way to use 4n35 for feedback?
 

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