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In synchronous rectification, is it the case that for the low side MOSFET to turn on, first the parasitic diode (body diode) conducts, and then the MOSFET turns on?
The parasitic diode is always a diode structure that occurs when the MOSFET is in the off state. Therefore, the parasitic diode conducts while the low side MOSFET is turned off, and thereafter the MOSFET turns on.