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In most of the SMPS design tool Vmax is limited to 265v ac whats the reason?

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nithin86

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In most of the SMPS flyback design tools the maximum input voltage is limited to 265v whats the reason????I need to design a smps which have atleast max input voltage of 300v ac. so whats the precaution i have to take when exceeding 265v?????
 

Make sure your primary FET can handle the higher mains voltage and reflected voltage, I suppose. Increase max source-drain voltage or re-dimension your snubber...
 
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