| 摘要 |
PROBLEM TO BE SOLVED: To suppress temperature rise of a drive IC.SOLUTION: A first transistor M1 is provided between a first terminal P1 and a third terminal P3. A second transistor M2 is provided between a second terminal P2 and the third terminal P3. An operational amplifier OA has a first input terminal to which a predetermined reference voltage Vis input, a second input terminal connected with the third terminal P3, and an output terminal connected with the control terminal of the first transistor M1. In a state where the first terminal P1 is connected with the other end of a corresponding LED string 6, an external resistor Rext is connected between the first terminal P1 and the second terminal P2, and a detection resistor Rs is connected between the third terminal P3 and the ground terminal, a drive IC 100 supplies a driving current Ito a corresponding LED string 6. |
