One embodiment of a circuit arrangement includes first and second input voltage terminals for applying an input voltage, and at least one first semiconductor switching element having a drive terminal and a load path, the load path being connected between the input voltage terminals. A drive circuit is configured to receive a supply voltage, and has a drive output connected to the drive terminal of the at least one semiconductor switching element. A free-running oscillator is configured to generate an oscillating output voltage. A voltage supply circuit is provided for receiving the oscillating output voltage or a voltage dependent on the oscillating output voltage, and for providing the supply voltage of the drive circuit.