Driving transistor control circuit

A driving transistor control circuit for controlling ON and OFF of a driving transistor connected in series with an electrical load between a power supply voltage and a ground, the driving transistor control circuit comprising:

• a pull-up resistor connected at one end to a power supply voltage side of the driving transistor;
• a current detection resistor configured to detect an electric current flowing from the driving transistor to the ground upon turn-ON of the driving transistor;
• a first current mirror circuit including a starting transistor connected between the pull-up resistor and the current detection resistor, the first current mirror circuit supplying a first mirror current mirroring the electric current flowing through the current detection resistor;
• and
• a driving current source circuit configured to supply a driving current to a control terminal of the driving transistor in accordance with the mirror current to turn ON the driving transistor in response to an external control signal.