Light-emitting diode dimming drive circuit working at low power supply voltage

The invention relates to the field of driving circuits, in particular to a light emitting diode dimming driving circuit working at low power supply voltage, which comprises a power supply, a capacitor, a constant current source generator, a first switch, a second switch and a third switch, in a first mode, the second switch and the third switch are configured to maintain a conduction state in response to a received pulse, and in a second mode, the second switch and the third switch are configured to maintain a conduction state in response to a received pulse; and the first switch is configured to be maintained in an off state; in the second mode, the second switch and the third switch are configured to be maintained in the off state, and the first switch is configured to be in the on state in response to the received pulse; the first mode and the second mode are alternately performed. Compared with a common Boost circuit, the driving circuit provided by the invention can save an inductor, and compared with a