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ATL431: Design of Flyback SMPS

Part Number: ATL431

Hello Expert,

I am planning to use ATL431BQDBZR for an SMPS of 5W 20V output and get get confused at designing the value of resistor and capacitor marked in the below figure. Is there any document/article available for the proper design of this circuit ?

Thanks and Regards 

Anoop kumar N

Project Engineer