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For 800W output its ok an half-bridge with 2xIRFP460 mos-fet's,or STE40NK90ZD super mosfets.
Don't need synchronous rectification for output.Its ok an dual 30A/200V fast recovery diode.
For PMW IC its better an SG3525 IC than TL494.
For schematic check diyaudio forum.You find lots of schematics...
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