| 摘要 |
A load driving circuit controls a feed of a power supply voltage of a power supply to a load. A power MOSFET is connected in series with the power supply and the load. A load driving state such as disconnection and short circuit of the load is detected by comparing a predetermined reference voltage and a voltage of the load and MOSFET node. For this, a pull-up resistor is connected between the power supply and the load. A diode is connected between source and gate of the MOSFET. A transistor circuit is connected between source and gate of the MOSFET to discharge a gate capacitance of the MOSFET. In a non-feed mode, a driving current is made to flow in a control electrode of the transistor circuit. The magnitude of the driving current is preferably enough to operate the transistor circuit and the voltage drop caused by the driving current is preferably smaller than a difference between the power supply voltage and the predetermined reference voltage.
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