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Which is the best suitable isolated flyback controller for the input upto 1KVDC and output of 20W ?

HPawa.1
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I am designing a Isolated Flyback SMPS with input range upto 1KV and output of 20W. I couldn't found any flyback controller which will support this range.

I found one offline PWM controller named STCH03 which is having limited 650V start-up.

So is it possible to extend the HV pin range of this controller upto 1KV by adding series resistors ?

Or is there any better controller that I can start working with ?

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