| 摘要 |
A power supply control unit of this invention has a stabilized power source by a DC/DC converter and a Zener diode for supplying selectively plural voltages and supplies a power to a current vibration type shut-off function provided switching circuit. When power supply from a power source to a low voltage load is controlled via switching by a temperature sensor incorporated FET, a reference voltage having a voltage characteristic equivalent to that of a voltage between terminals of the temperature sensor incorporated FET to which a predetermined load is connected is generated by a reference FET and a resistor. A difference between a voltage between the terminals of the temperature sensor incorporated FET and the reference voltage is detected by a comparator. Then, the ON/OFF of the temperature sensor incorporated FET is controlled depending on a difference between the voltage between the terminals and the reference voltage by a driving circuit.
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