| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption due to a starting current for starting switching control means.SOLUTION: An LED current control circuit 10 includes: a valley-fill circuit 3; a starting circuit 4a supplied with a starting current; and a switching output circuit 6 which changes a control frequency for controlling the ON/OFF operation of a switching element Q2. A cathode terminal of a diode D10 of the valley-fill circuit 3 is electrically connected to a collector terminal of a transistor Q1 of the starting circuit 4a. |
