undervoltage lockout for flyback powersupply input

From: Jamie Morken <jmorken@xxxxxxx>
Date: Sun, 02 Dec 2007 13:18:32 GMT

Hi,

I have a flyback powersupply that operates from about 20V to 450V+ (AC or DC input) and I would like to reduce the operation to 75V to 450V,
what is a possible circuit to use on its input to keep it from starting
up until this threshold is reached?

cheers,
Jamie

.

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