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variable high voltage dc power supply using lnk306

Posted by: Tejashree on

I have designed 554V dc power supply by referring to the document DI-210. Please tell me how to make output variable from 100V to 500V. I tried using potentiometer in the feedback circuit in divider so as to vary the voltage but i'm not getting line regulation below output voltage 350V. Please tell me the changes in the circuit and also why so?