Single-inductor LED drive circuit and drive method

The invention discloses a single-inductor LED drive circuit and a drive method, wherein the output signal of a power-level circuit is controlled to be constant through a constant-current control circuit, so as to provide a constant current signal for an LED load, and the brightness of the LED load is controlled through a dimming control unit, a constant-voltage generation circuit is used for receiving the current signal of the output end of the power-level circuit and acquiring a reserved power supply voltage, and the reserved power supply voltage is used for providing a power supply voltage for the dimming control unit. Compared with the scheme of the prior art, the technical scheme of the invention does not need an independent power supply voltage chip, components such as inductors and rectifier tubes are reduced, a peripheral circuit is simple, and the overall volume of a system is also greatly reduced.