Sanken Electric Co., Ltd.

Keita Ishikura

Akiteru Chiba

Provided is a synchronous rectifier circuit which, even if a synchronous rectification element having a low on-resistance is used, can perform a synchronous rectifying operation without being influenced by the inductance component. It is a synchronous rectifier circuit having a synchronous rectification element Qand a synchronous rectification control circuit ICfor turning on/off the synchronous rectification element Qin accordance with the current iflowing through the synchronous rectification element Q, including a current detection circuit for detecting the current iflowing through the synchronous rectification element Qduring an on-period of the synchronous rectification element Qas a synchronized voltage waveform, the synchronous rectification control circuit ICbeing configured so as to turn off the synchronous rectification element Qon the basis of the voltage waveform detected by the current detection circuit

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Niiza, Japan

Keita Ishikura