| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device capable of being stably operated irrespective of an operation state of a load. SOLUTION: A voltage generation unit generates a driving voltage Vout for driving an LED 110. A first feedback path 40 performs feedback of a voltage Vfb1 according to the voltage Vout at one end of the LED 110. A second feedback path 50 performs feedback of a voltage Vfb2 according to the other end of a voltage Vled of the LED 110. A current driving circuit 30 is provided on a path for driving the LED 110 by the voltage producing unit 10. A control circuit 20 controls the voltage producing unit 10 so that any one of the first and second feedback voltages Vfb1, Vfb2 which are respectively subjected to the feedback by the first feedback path 40 and the second feedback path 50 so that it approaches to a predetermined reference voltage Vref. COPYRIGHT: (C)2008,JPO&INPIT |
