The RCD snubber circuit and MOSFET drain voltage waveform
are shown in figure 10 and 11, respectively. The RCD
snubber network absorbs the current in the leakage inductance
by turning on the snubber diode (Dsn) once the MOSFET
drain voltage exceeds the voltage of node X as depicted
in figure 10. In the analysis of snubber network, it is
assumed that the snubber capacitor is large enough that its
voltage does not change significantly during one switching
cycle