SMPS IR2153 vs ATX transformers

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IR2153_Soft start & prot

short circuit protection
 

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hi, i have a question about this Jednoduchý neregulovaný zdroj 2x 35V 2x 5A 350W pro zesilova? power supply.
i've been using it in an audio amplifier and works ok for 3 years now, but now i want a 500W version.
a long time ago i've tried SiHG24N65E-GE3 (they're samples) and blew up, so my question is there a reason they don't work as oposed to IRF840?
thanks
 
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