Design and Implementation of an Over Temperature Protection Circuit

Based on the theory of thermal characteristic of diode and use reference voltage compare with diode temperature to realize a thermal shutdown circuit within thermal hysteresis. Bandgap circuit was used to provide reference voltage. Detailed theory derivation and design method were gave by this paper, the corresponding solution of the difficult part was also gave. By the comparison of simulation and test result we can know that this kind of thermal shutdown circuit can realize accurate thermal shutdown and hysteresis.