Short-circuit protection circuit of DC/DC converter

The utility model relates to a short-circuit protection circuit of a DC/DC (Direct Current/Direct Current) converter, which aims to solve the problems of more devices, large occupied space, high cost and high realization difficulty under the high integration requirement of the existing circuit, and comprises the following steps of: prohibiting the low level of the RESET end of a 555 integrated circuit IC1, and connecting the RESET end with a VCC (Voltage to Current Converter) power supply end; the THR end and the TRIG end are connected to the C1 and the GND through the capacitor, and are connected with the DISC end through the R2; the OUT end is connected with the CVOLT end through the R1; the power supply end of the 555 integrated circuit IC1 is connected with the voltage reference end VREF of the pulse width modulator IC2, and the DISC end of the 555 integrated circuit IC1 is connected with the COMP end of the pulse width modulator IC2; according to the utility model, the short-circuit protection function i