MOSFET Amplifier IRFP240/IRFP9240

Fan Control with signal from amp outputs...
 

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apexaudio, I corrected your diagram above. It's better that way.
And I don't think the PEAK circuit is calculated or work correctly!!
 

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Last edited:
dear bushulo,
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hello, is it safe to use 2x63V for 3 pairs of IRFP240/9240? This should give about 250W to 4 ohms. There is no problem at 1khz and 10khz, but when we go close to limitation at 100hz in 4 ohms, then all IRFP240 burn. Maybe these transistors are fake?
 
3pr of 240/9240 adds up to ~900W of output devices.
Divide by 4 for MosFETs and you get ~225.

Your target of 240W into 4r0 is close enough to 225 to be considered as reliable.

However, your target of 240W and +-63Vdc do not seem compatible !
 
I get 300W to 320W from +-58.5Vdc supply rail using BJT output stages.
A mosFET output stage may require upto 5V more on the supply rails to achieve that 300 to 320 target.

But you are showing a target of "only" 240W from supply rails that are 4.5V higher. That seems odd.