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The HR1124S、HR1154D is a 1-channel H-bridge driver IC for DC motor application. It has the features of low stand-by current, low operating current, large current output and low RDSON. Those features make it suitable for toy.When load motor with low internal resistance is in locked rotor or output is short-circuit, HR1124S、HR1154D output current will increase momentarily, power dissipation of the circuit will go up sharply, and the chip temperature will soar. But, when the chip temperature exceeds a maximum temperature point (typically 150℃) set by internal temperature protection circuit, the internal circuit will switch off the on-chip power switching transistor of It，and switch off load current, preventing potential safety hazards such as fuming, ligniting, etc. of plastic package caused by over-high temperature. Only after having confirmed that the circuit has returned to safety temperature, can the on-chip temperature hysteresis circuit be allowed to re-control the circuit.