SYNCHRONOUS RECTIFICATION CONTROL CIRCUIT, LOW-VOLTAGE MOTOR DRIVE CIRCUIT, AND SYNCHRONOUS RECTIFICATION CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide an inductive load driven by a power MOSFET in a unit such as a low-voltage motor drive, using synchronous rectification for reduction in a voltage drop across a body diode of the power MOSFET.;SOLUTION: A comparative feedback circuit measures voltage across the power MOSFET4 for determining the timing that the body diode 14 is conducting, and turns on the MOSFET4 during a conducting cycle and turns off it to inhibit counter current. An obtained synchronous rectification function is very sensitive to electric current, while a very small number of parts are being used with little complexity.;COPYRIGHT: (C)2005,JPO&NCIPI