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Problem regarding MOSFET

Nigella

I have generated PWM through SG3525 IC and then I have given its output to IR2110 to make it a 12-volt PWM by which I am driving MOSFET (IRF540) at a 10 to 40% duty cycle. when I place CHOPPER at the source of this MOSFET then MOSFET gets too heated.

(drain voltage for MOSFET is 12 to 17 voltage)

Without placing a chopper it's working fine but with a chopper it gets heated...

Can anyone guide me on why MOSFET(IRF540) is getting heat???

I would be highly thankful to you people...