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Traditional voltage sensing method has already been widely used for the synchronous rectifier. However, the parasitic parameters will cause the false turn-on and early turn-off problem. In this paper, the conception of zero-crossing noise filter is presented. By applying this filter to the synchronous rectifier, the false turn-on and early turnoff problem can be resolved. Only three passive components...
A new driving method for SR is presented. By applying a zero-crossing noise filter to the MOSFET, the false-triggering of the SR can be effectively eliminated. Moreover, the resistor and the capacitor in the filter can be used as a compensator to solve the duty cycle loss issue caused by the trace inductance of the MOSFET package. Only three passive components are needed in the proposed filter which...
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