| 摘要 |
A vehicular lamp lighting circuit includes a control unit configured to control an electric current that flows to a light source unit. The control unit has an electric current supply section configured to output the electric current to the light source unit, a switching controller configured to compare, with a reference voltage, and to control, by switching, the electric current that is outputted from the electric current supply section, an output current detection section configured to detect the electric current that flows into the light source unit, and a voltage transform circuit configured to transform an electric potential difference that arises from the electric current that flows into the output current detection section into a difference voltage and to output the difference voltage thus converted to the switching controller.
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