LED light-emitting device, LED driving circuit and constant-current driving controller of LED driving circuit

The invention belongs to the technical field of LED driving and provides an LED light-emitting device, an LED driving circuit and a constant-current driving controller of the LED driving circuit. The constant-current driving controller which comprises an oscillator module, a main control module, a switch module, an output current detecting module, a peak current detecting module and an overvoltage detecting module is used in the LED driving circuit. The circuit is simple in structure and small in size. The output current detecting module detects output currents of the switch module, the main control module controls the switch module to adjust output currents according to preset current values and according to detecting results, so that the purpose of constant current output is achieved, when the peak current detecting module detects the fact that the peak currents of the switch module are too large or the overvoltage detecting module detects the fact that the output voltages of an output stage circuit of the LED driving circuit are too large, the main control module controls the switch module to stop outputting direct currents, so that overcurrent or overvoltage protection is achieved, driving reliability is improved, and the service life of an LED can be well prolonged.