A driving circuit, comprising: - a rectifier circuit (2, C1) configured to convert AC voltage from an AC power source to a DC voltage; - a voltage converter circuit being configured to convert the DC voltage converted by the rectifier circuit (2, C1) to a desired magnitude and to supply the converted DC voltage to a load, the voltage converter circuit having: - a transformer including a primary coil on a primary side of the transformer, the primary coil being connected to the DC voltage converted by the rectifier circuit (2, C1), and a secondary coil on a secondary side of the transformer, - a switching element provided on the primary side of the transformer, - a rectifying diode provided on the secondary side of the transformer, and - a smoothing capacitor connected to a node between the secondary coil of the transformer and the load; and - a drive IC circuit (4; 7) including a control circuit configured to control the on-duty of the switching element of the voltage converter circuit for supplying a predetermined DC current to the load from the secondary side of the transformer; characterized in that the driving circuit is an LED driving circuit, and the load includes a plurality of light emitting diodes, LEDs, the LED driving circuit being configured to control lighting of the LEDs and the voltage converter circuit being configured to supply the converted DC voltage to the LEDs to cause the LEDs to emit light; and a power source terminal of the drive IC circuit (4; 7) is connected to one end of the smoothing capacitor via the node, so as to supply a drive current to the drive IC circuit (4; 7) using accumulated charge of the smoothing capacitor. - a rectifier circuit (2, C1) configured to convert AC voltage from an AC power source to a DC voltage; - a voltage converter circuit being configured to convert the DC voltage converted by the rectifier circuit (2, C1) to a desired magnitude and to supply the converted DC voltage to a load, the voltage converter circuit having: - a transformer including a primary coil on a primary side of the transformer, the primary coil being connected to the DC voltage converted by the rectifier circuit (2, C1), and a secondary coil on a secondary side of the transformer, - a switching element provided on the primary side of the transformer, - a rectifying diode provided on the secondary side of the transformer, and - a smoothing capacitor connected to a node between the secondary coil of the transformer and the load; and - a transformer including a primary coil on a primary side of the transformer, the primary coil being connected to the DC voltage converted by the rectifier circuit (2, C1), and a secondary coil on a secondary side of the transformer, - a switching element provided on the primary side of the transformer, - a rectifying diode provided on the secondary side of the transformer, and - a smoothing capacitor connected to a node between the secondary coil of the transformer and the load; and - a drive IC circuit (4; 7) including a control circuit configured to control the on-duty of the switching element of the voltage converter circuit for supplying a predetermined DC current to the load from the secondary side of the transformer;