Soft-start circuit and short circuit protection method

The present invention discloses a soft start circuit and short circuit protection, comprising a short-circuit detection circuit, a discharge circuit and a discharge control circuit, an output voltage detecting circuit detects the short-circuit of the main circuit to determine whether a short circuit occurs from the input terminal of the discharge circuit charging the energy storage element to generate the soft-start reference signal; when a short circuit occurs, the short-circuit detection circuit detects the short circuit, short-circuit signal; said discharge control circuit includes a clamp circuit, said clamp circuit receiving a reference softstart signal is generated when the soft-start reference signal reaches a clamp voltage discharge control signal clamping circuit, short-circuit signal is generated by the discharge signal and a discharge control signal, a discharge circuit receives the discharge signal to the discharge circuit discharges the energy storage element to reducing soft-start reference signal. According to the present invention, the main circuit chip can be prevented from overheat or burn out in a short circuit phenomenon, after a short circuit, the main circuit output voltage headroom for the soft-start reference follower, the output voltage to avoid overcharging.