Lighting circuit and vehicle lamp
There is provided a lighting circuit configured to drive a light source including a plurality of light emitting units connected in series. The lighting circuit includes a converter which is configured to supply a drive current to the light source, a plurality of high-side switches, each of which is provided between one end of a corresponding light emitting unit and one output of the converter, and a plurality of low-side switches, each of which is provided between another end of the corresponding light emitting unit and another output of the converter.
1. A lighting circuit configured to drive a light source including a plurality of light emitting units connected in series, the lighting circuit comprising:
a converter which is configured to supply a drive current to the light source;
a plurality of high-side switches, each of which is provided between one end of a corresponding light emitting unit and one output of the converter; and
a plurality of low-side switches, each of which is provided between another end of the corresponding light emitting unit and another output of the converter.
2. The lighting circuit according to claim 1 , further comprising:
a diode which is provided between respective adjacent light emitting units.
3. The lighting circuit according to claim 1 , further comprising:
a plurality of monitoring circuits, each of which is configured to monitor an electrical state of one end of a corresponding light emitting unit.
4. The lighting circuit according to claim 1 ,
wherein the another output of the converter is grounded, and
wherein each low-side switch is provided between the another end of the corresponding light emitting unit and the ground.
5. A vehicle lamp comprising:
a light source which includes a plurality of light emitting units connected in series; and
the lighting circuit according to claim 1 which is configured to drive the light source.