INSULATION SYNCHRONOUS RECTIFICATION TYPE DC/DC CONVERTER, SECONDARY SIDE CONTROLLER, ELECTRIC POSER SUPPLY USING THEM, ELECTRIC POWER ADAPTOR, AND ELECTRONIC DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a secondary side controller capable of preventing a malfunction.SOLUTION: An external circuit element Ris connected to a SET terminal at use. A synchronous rectification controller 304 generates a pulse signal S1 on the basis of a management time determined in accordance with a state of the SET terminal. A driver 306 switches a synchronous rectification transistor M2 corresponding to the pulse signal S1. An abnormal detection circuit 320 can detect an open state of the SET terminal and/or a short circuit state, and asserts a detection signal S11 when detecting the open state of the SET terminal and/or short circuit state. When the detection signal S11 is asserted, a switching stop of a switching transistor M1 is indicated to a primary side controller 202 provided to a primary side of a DC/DC converter 200.SELECTED DRAWING: Figure 2