GaN-driven power switching power supply system and its control circuit

Abstract

This invention provides a control circuit for use in a GaN-driven power switching power supply system, configured to: when the GaN-driven power switching power supply system is in a light-load mode, control a first power supply path control switch to be in a closed state, and generate a second path switch control signal for controlling the opening and closing of a second power supply path control switch and a second power switch control signal for controlling the opening and closing of a power drive switch based on the supply voltage on the supply capacitor and a first power switch control signal for controlling the opening and closing of the GaN power switch; or when the GaN-driven power switching power supply system is in a non-light-load mode, control the second power supply path control switch to be in a closed state, and generate a first path switch control signal for controlling the opening and closing of the first power supply path control switch and a second power switch control signal based on the supply voltage on the supply capacitor and the first power switch control signal.

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