Help with 10-15W class d amplifier

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Hi Guys,
I really need help for designing my project, which is designing a 10-15w class d amplifier feeding with a battery. I have designed my project with 2 tl082CN for triangular wave oscillator(~125kHz), 1 lm339n comparator , 1 tc4420 and 1 tc4429 gate driver and 2 mosfets(irf23BD..) and an output filter of 20 kHz low pass. I am supplying +-10V to the drain and source of the mosfets and + 5 v for the gate drivers. But unfortunately, I have some heat problems for mosfets ans I could not get the required power. Could you please hel me to solve the problem?

Thanks:confused:
 
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