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I would like to use LNK3205P, Is it o.k. to pwer off at 400Vdc ?see attached schematic


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Hi sphaviseth@duka,

Thank you for using Power Integrations' part.

Regarding your question, you can power it up from 400Vdc input.  The MOSFET rating of LNK3205 is 725V and since you are using buck topology, the MOSFET stress is limited to your 400V input voltage which is still way below its 725V rating.  Please use higher input cap rating of atleast 450V so you have enough stress margin.  Buck diode is good rated with 600Vdc.