DETECTING CIRCUIT AND SYNCHRONOUSLY RECTIFYING CIRCUIT

摘要

A detecting circuit (100) and a synchronously rectifying circuit are used for detecting and controlling a MOSFET of the synchronously rectifying circuit and solve a technical problem that a voltage value of the drain-source voltage of the MOSFET and a current value of the drain-source current of the MOSFET can not be detected accurately. The detecting circuit (100) comprises an inductor module (1), a resistance module (2) and a detecting module (3), and the inductor module (1) and the resistance module (2) serially connected to each other are connected between the source and drain of the MOSFET. The detecting module (3) gets a voltage value between a connection point of the inductor module (1) and the resistance module (2) and the source of the MOSFET or a current value flowing through the resistance module (2) and the source of the MOSFET by measuring, and gets an effective voltage value of the source-drain of the MOSFET or an effective current value of the source-drain of the MOSFET according to the voltage or the current.