ISOLATED DC/DC CONVERTER, FEEDBACK CIRCUIT THEREOF, POWER SUPPLY DEVICE, POWER SUPPLY ADAPTOR, AND ELECTRONIC DEVICE USING THE SAME

摘要

A feedback circuit includes: an input terminal which receives a voltage detection signal corresponding to an output voltage of a DC/DC converter; an output terminal connected to an input side of the photo coupler; a ground terminal; a shunt regulator configured to amplify an error between the voltage detection signal and its target voltage and pull up a first current corresponding to the error from the input side of the photo coupler via the output terminal; and a protection circuit configured to pull up a second current from the input side of the photo coupler via the output terminal when an abnormality of the secondary side of the DC/DC converter is detected. The feedback circuit is packaged into a single module.