Power supply control device having a switch that varies according to an ambient temperature

A power supply control device for controlling power supply by turning on or off a semiconductor switch through which a current flows, comprising:

• a resistor having one end connected to one end on an upstream side of the semiconductor switch;
• a current regulation circuit configured to regulate a current flowing through the resistor to a current proportional to a voltage across the semiconductor switch;
• a resistor circuit disposed in a current path through which the current flowing through the resistor flows;
• and
• a switching circuit configured to turn off the semiconductor switch when the voltage across the resistor circuit exceeds a predetermined voltage,
• wherein the on-resistance of the semiconductor switch varies according to an ambient temperature of the semiconductor switch, and
• the resistance of the resistor circuit varies, according to the ambient temperature, in a direction different from a direction in which the on-resistance varies.