VEHICULAR LED LIGHTING CONTROL CIRCUIT, VEHICULAR LED LIGHTING CONTROL DEVICE, AND METHOD FOR CONTROLLING VEHICULAR LED LIGHTING CONTROL CIRCUIT

摘要

This vehicular LED lighting control circuit is provided with: a first adjustment resistor having one end connected to the cathode-side of an LED lamp; a second adjustment resistor having one end connected to the other end of the first adjustment resistor and having the other end connected to a second wire; an adjustment bipolar transistor having one end connected to the one end of the first adjustment resistor and having the other end connected to the other end of the first adjustment resistor; a limiting transistor having one end connected to the anode-side of the LED lamp and having the other end connected to a control terminal of the adjustment bipolar transistor; and a reference voltage generation circuit having one end connected to the control terminal of the adjustment bipolar transistor and having the other end connected to the other end of the second adjustment resistor, the reference voltage generation circuit applying a reference voltage between the control terminal of the adjustment bipolar transistor and the other end of the second adjustment resistor.