LM393 Detex audio class D amp

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hi all.

i made this amp:
2010539200_1449061853.jpg


it work but have very low power.
and + rail mosfet get warmer.

i need your helps to solve these problems and power up it to 400w/4R.
 
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is this sch better than upper sch?

364898d1375990908-diy-class-amplifier-d2-12v-jpg


i don't like to use irs2092 because i can't find original ic.2092 expensive.

i just like to make class d amp with 494 or 3525 or with op amp.

i tested 494 but mosfets get warmer about 50 60 degree.
if anyone have tested sch of class d amp with tl494 or sg3525,ir2153 or etc plaese send here to use or send here refrence address
 
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i didn't see. i don't need hifi quality because i use it for subwoofer.

and UCD 's board a little big. I have space restrictions
IC occupies less space.

What do you think of the circuits I've posted?

I love this schematic how is it:

397639d1391476649-diy-class-amplifier-klas-d3-gif


As i don't get good result from TL494 ic for class d,I don't know about it works.
but someone has tested it and get good result.

see here:
DIY Good Class D amplifier
 
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