The invention belongs to the technical field of
constant current driving, and provides an LED lighting device, an LED
driving circuit and a switch power source driving
chip of the LED
driving circuit. The switch power source driving
chip comprises a switch device, a
logic control module, a first
voltage comparison module and a
degaussing detection module. The input end of the first
voltage comparison module is connected with the input end of an output stage circuit, the output end of the first
voltage comparison module is connected with the first input end of the
logic control module, the first input end of the
degaussing detection module is connected with the voltage output end of an output circuit, the second input end of the
degaussing detection module is connected with the output end of the
logic control module, the output end of the degaussing detection module is connected with the second input end of the logic control module, and the
switching frequency of the switch device is adjusted by the logic control module according to control signals output by the first voltage comparison module and the degaussing detection module. Compared with the prior art, the LED lighting device, the LED
driving circuit and the switch power source driving
chip are high in
constant current accuracy, simple in circuit structure and low in manufacturing cost.