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1. A load drive circuit comprising:
a switch electrically connected between a first terminal electrically connected to a power supply and a second terminal electrically connected to a load; a first comparator that compares a first reference voltage lower than an input voltage inputted to the first terminal with a voltage of the second terminal, and detects, based on the comparison, a load open state where the switch is off and the load is not electrically connected to the second terminal; a clamp circuit that clamps the voltage of the second terminal to a clamp voltage higher than the first reference voltage and lower than the input voltage, when the first comparator detects the load open state; a second comparator that compares a second reference voltage lower than the input voltage and higher than the clamp voltage with the voltage of the second terminal, and detects, based on the comparison, an output-to-supply short circuit state where the switch is off and the second terminal is electrically connected to the power supply; a bootstrap circuit that generates a constant voltage based on the input voltage of the first terminal, and supplies a charge current to a capacitor connectable to the load device through the third terminal at the constant voltage; and a clamp voltage rise prevention circuit that prevents the clamp voltage of the clamp circuit from rising, when the first comparator detects the load open state. |
