Switching circuit and power supply circuit

A switching circuit comprising two series transistors,

• wherein the switching circuit is structured
• such that a high-withstand-voltage transistor is disposed on a high-voltage side, and a low-withstand-voltage transistor is disposed on a low-voltage side, and
• such that a high-voltage terminal of the low-withstand-voltage transistor is connected to a reference terminal of the high-withstand-voltage transistor, and
• the switching circuit comprises a transistor-series path from a reference terminal of the low-withstand-voltage transistor to the reference terminal of the high-withstand-voltage transistor,
• a control terminal of the high-withstand-voltage transistor includes a transistor-control path connected to the reference terminal of the low-withstand-voltage transistor,
• wherein the transistor-control path includes a gate resistor,
• wherein the gate resistor is connected to a gate diode in parallel, and
• wherein the gate diode is structured
• such that an anode is connected to the control terminal of the high-withstand-voltage transistor,
• such that a cathode is connected to the reference terminal of the low-withstand-voltage transistor, and
• such that an inter-terminal capacitance is equal to or less than 20% of an input capacitance of the high-withstand-voltage transistor.