INSULATING SYNCHRONOUS RECTIFYING DC/DC CONVERTER, SYNCHRONOUS RECTIFYING CONTROLLER, POWER SUPPLY USING THE SAME, POWER ADAPTER AND ELECTRONIC DEVICE, AND CONTROL METHOD OF SYNCHRONOUS RECTIFYING CONTROLLER
A synchronous rectifying controller on secondary side of insulating synchronous rectifying converter to control synchronous rectifying transistor, comprising: first comparator to compare drain voltage of the transistor with first negative threshold voltage, and assert set signal based on the comparison of them; second comparator to compare drain voltage with second negative threshold voltage, and assert reset signal based on the comparison of them; third comparator to compare drain voltage with third positive threshold voltage, and assert release signal based on the comparison of them; control circuit set in response to the assertion of the set signal and to adjust control pulse to have ON level, and reset in response to the assertion of the reset signal and to adjust the control pulse to have OFF level; and driver to drive the transistor, wherein set operation of the control circuit is inhibited until the release signal is asserted.
