Flyback constant-current driving circuit and flyback constant-current driving control system containing flyback constant-current driving circuit

The invention provides a flyback constant-current driving circuit and a flyback constant-current driving control system containing the flyback constant-current driving circuit. The driving circuit comprises a voltage regulator tube, a PWM (Pulse-Width Modulation) control circuit and a first switch, wherein an anode of the voltage regulator tube is connected with a power supply port and a cathode of the voltage regulator tube is connected with a ground port; the PWM control circuit is connected with the power supply port, the ground port, a feedback port and a sampling port; a driving signal is generated according to a power supply signal received from the power supply port, a feedback signal received from the feedback port and a sampling signal received from the sampling port; a control end of the first switch receives the driving signal, and an input end of the first switch is connected with the feedback port and an output end of the first switch is connected with the sampling port. According to the driving circuit, the starting time is shortened effectively, and peripheral elements are reduced and the system cost is lowered.