CONTROL CIRCUIT AND RELATED INTEGRATED CIRCUIT AND SWITCHING-TYPE CONVERTER

摘要

A control circuit can include: a power supply circuit having a bias capacitor coupled between a power terminal and a common node, where the power supply circuit supplies power to the control circuit via the bias capacitor; a detection circuit coupled between the common node and a current output terminal of a main power switch of a power stage circuit, to detect current flowing through the main power switch; a current feedback circuit that generates a feedback signal according to a difference value between a sense value obtained from a voltage at the power terminal during an off state of the main power switch and a present voltage at the power terminal, where the feedback signal represents an inductor current of the power stage circuit; and a control signal generator that generates a control signal according to the feedback signal to control the main power switch.

主权项

1. A control circuit, comprising:
a) a power supply circuit comprising a bias capacitor coupled between a power terminal and a common node, wherein said power supply circuit is configured to supply power to said control circuit via said bias capacitor; b) a detection circuit coupled between said common node and a current output terminal of a main power switch of a power stage circuit, wherein said detection circuit is configured to detect current flowing through said main power switch; c) a current feedback circuit configured to generate a feedback signal according to a difference value between a sense value obtained from a voltage at said power terminal during an off state of said main power switch and a present voltage at said power terminal, wherein said feedback signal represents an inductor current of said power stage circuit; and d) a control signal generator configured to generate a control signal according to said feedback signal to control said main power switch.