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simple 48v(at)20A SMPS - please help

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redfox750

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48v@20A SMPS

hi All,

I've got that new STE40NK90ZD super mosfet models it's rated 900v@40A

i want to design SMPS with input 350VDC and output 40VDC @ 20A

it's about 800 watt SMPS, i want to know if i can use fly back topology with 1 mosfet or i had to use half bridge for that?

also any schematics for such SMPS are welcome

I'm planning also on using the TL494 as PWM as i have many and read a bit about it if there is better PWM also please tell me

I want it as simple as it can be , i also have the transformer ready

thanks all
 

for that you need full bridge.
becasue it is high current .......also you need synchronous diodes so you reduce loss
 

can't i simply use half bridge like computer smps and use powerful IGBTs with no isolation between PWM and IGBTs gate, or parallel more than one in half bridge configuration?
 

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 there.
 

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