LED driving circuit, LED driving system and LED indicating lamp

The utility model relates to an LED driving circuit, an LED driving system and an LED indicating lamp. The LED driving circuit comprises a power supply, at least one switching power supply driving circuit and at least one control signal conversion circuit. The switching power supply driving circuit comprises a chip U1 and an external MOS tube Q1. The chip U1 comprises a dimming pin, a VDD pin and a GATE pin; an input end of the switching power supply driving circuit is connected with a power supply, an output end of the switching power supply driving circuit is connected with an LED, a dimming pin and a VDD pin of the chip U1 are respectively connected with the control signal conversion circuit, and a GATE pin of the chip U1 is connected with the MOS tube. According to the utility model, the circuit loss of the RGBW LED lamp is reduced through the high energy efficiency ratio of voltage conversion of the switching power supply driving circuit, the light-emitting energy efficiency is improved, and energy conse