Integrated circuit for power factor correction and power supply circuit containing the same

Abstract

A power supply circuit that generates an output voltage from an AC voltage. The power supply circuit includes a rectifier circuit that rectifies the AC voltage, an inductor receives a rectified voltage from the rectifier circuit, a transistor that controls an inductor current flowing through the inductor, and an integrated circuit that performs switching of the transistor. The integrated circuit includes an error output circuit that outputs an error between a feedback voltage and a reference voltage, a target value generating circuit that generates a target value of the inductor current based on the error, an adjustment circuit that adjusts the target value, first and second comparison circuits that compare the inductor current with a predetermined value and with the target value, respectively, and a drive circuit that turns on the transistor when the inductor current reaches the predetermined value, and turns off the transistor when the inductor current reaches the target value.