The explanation of the error

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I got the error in PI Expert that “The drain-source voltage is close to breakdown.”
Could you advise anything? What can the reasons of this error be?

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Dear Tallmen,

Thank you for using Power Integrations ICs!

The VDRAIN is roughly equal to(roughly because we do set some margin) VDRAIN = VMAX +VOR.

So if you want to lower it, you either reduce the VMAX(AC input) or reduce VOR.