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sg3525 gets mosfets heated

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dave_j_fan:
dear all
 i am trying Sg3525 inverter.
issue is Mosfets getting superhot in 2-3min


original maker showed no use of heatsinks..so i have not added heatsink

just running 60w tablefan

pcb ofthe originalmaker is like this u cab see the connections
very.clearly.

please advice how to reduce heating.

i swapped diodes 4007 and mosfets z44

running 60wtable fan

transformer  15amp 12v

T3sl4co1l:
Schematic?  :-//

Tim

dave_j_fan:
attached pcb
has good clarity.


i will draw a schem.if not clear.

oPossum:
High side gate drive is probably horrible. Slow opto to turn it on, and a 2k resistor to slowly turn it off. A proper bootstraped gate driver IC would be a big improvement.

dave_j_fan:
any alternate circuits.. avoiding ic due to cost increase

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