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The loss of the switch over one cycle plus the loss of the diode over one cycle gives you the total loss over the cycle. Multiply that with frequency to give you the total heat energy per second into the heatsink.
You need an airgap in the transformer.The primary voltage should be clamped by
the reflected secondary voltage(the voltage on the capacitor).
The snubber's job is to clamp the voltage due to the leakage inductance only.
The loop gain of the converter changes between DCM and CCM.
When you monitor the feedback amp output on a scope,you can see the dip when
the converter changes from CCM to DCM as you lower the load.
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