POWER CONVERTER CONTROLLER, POWER CONVERTER, AND METHOD FOR DETECTING INPUT OF POWER CONVERTER

摘要

PROBLEM TO BE SOLVED: To provide a power converter controller for detecting an alternating-current input voltage, a power converter including a controller and actuated at a low load and high efficiency, and a method for detecting an input of the power converter.SOLUTION: A power converter controller includes a switch driver circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from an input of the power converter to an output of the power converter. An input sense circuit is coupled to receive an input sense signal representative of the input of a power converter. A sense enable circuit is coupled to receive the drive signal to generate a sense enable signal to control the input sense circuit in response to the drive signal. The sense enable signal is coupled to control the input sense circuit to sense the input sense signal continuously in response to a first load condition, and sense the input sense signal only during a fraction of a switching period of the power switch in response to a second load condition.