Driver circuitry

A driver circuitry comprising:

• a voltage application circuitry which is connected to a drive terminal of a transistor, and controls a voltage of an input signal and applies to the drive terminal;
• a current detection circuitry which is connected to an output terminal of the transistor, and detects that a current output from the transistor becomes a size of a predetermined current or more;
• a control circuitry which is connected to the current detection circuitry, and controls the voltage application circuitry based on the voltage of the input signal to output a voltage between the drive terminal and the output terminal at a timing when the current detection circuitry detects the current of the predetermined current or more;
• a current source which outputs a current;
• a first switch which is connected to the drive terminal and the current source, and switches a connection state between the current source and the drive terminal;
• a second switch which is connected to the drive terminal, and switches a connection state with the drive terminal while being synchronized with the first switch;
• and
• a differential amplifier circuitry whose input side is connected to the output terminal through the second switch, and to the current source through the first switch and the second switch, and whose output side is connected to the control circuitry, and which outputs a potential difference between an electric potential at the current source and an electric potential at the output terminal to the control circuitry, wherein:
• the control circuitry acquires the voltage between the drive terminal and the output terminal based on the potential difference output by the differential amplifier circuitry.