Abstract---Synchronous rectification is widely used in low voltage high current applications to reduce conduction loss. Common source inductance is the inductance shared by gate driver loop and main power transfer path. Minimization of common source inductance has been accepted as a common design rule for power converters involve power MOSFET. In this paper, the effects of commons source inductance for control and sync FET are explored in detail. In contra to traditional belief, common source inductance of sync FET could provide significant benefits. With common source inductance, minimal dead time, shoot through prevention and Cdv/dt immunity could be achieved for sync FET. Significant improvement on power loss could be achieved for synchronous rectification.
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