Circuit suitable for multi-path LED current-sharing control

The invention discloses a circuit suitable for multi-path LED current-sharing control, which comprises a single-output constant current source, multiple DC/DC sharing circuits and a load including multiple LED lamps; and each DC/DC sharing circuit comprises a DC/DC converter circuit, a current-sharing control circuit and a PWM (Pulse-Width Modulation) signal generator, wherein each DC/DC sharing circuit is provided with one LED load. The invention has the benefits that firstly, when multiple LED load voltages are close, the multiple DC/DC sharing circuits all work in the high-efficiency state; secondly, the cost and the volume of the multiple DC/DC converters can be effectively reduced; thirdly, the multiple DC/DC sharing circuits are independent from the single-output constant current source, can be independently used as the modules, and are suitable for the standard single constant-current power supply; and the constant current value of the pre-stage single constant-current source is required to be changed according to the demands of dimming, the multiple DC/DC sharing circuits still can keep each path of current automatically shared.