RCD电路设计指南 This article presents some design guidelines for the RCD snubber of flyback converters. When the MOSFET turns off,a high-voltage spike occurs on the drain pin because of a resonance between the leakage inductor (Llk) of the main transformer and the output capacitor (COSS) of the MOSFET. The excessive voltage on the drain pin may lead to an avalanche breakdown and eventually damage the MOSFET. Therefore,it is necessary to add an additional circuit to clamp the voltage.
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