deletemeplease
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The schematic is correct for his SMPS topology.The snubber diode D2 should go around only the transformer coil, not that and Q2
Allows you to use lower voltage rated FETs and to reduce the amount of leakage inductance energy that has to be dissipated.Question - why are you using two FET's in this circuit? What does Q2 contribute?
There might be current flowing through the body diode to the input cap when the FETs are turned off.What I don't understand is how one MOSFET can get substantially hotter than the other MOSFET in a circuit where they are both turned on and off at the same time.
Most power designers end up measuring this but a good first order equation is:The problem is, I really don't have the equations necessary to calculate what kind of losses I can expect from switching