| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor integrated circuit for controlling a power supply capable of suppressing increase in the number of components and a mounting area caused by increase in the number of LEDs, and of avoiding unevenness in brightness of a screen of a liquid crystal panel using the LEDs as a back light. <P>SOLUTION: A semiconductor integrated circuit for driving a power supply, configuring a power supply device for driving LEDs that drives a switching element (SW1) applying a current to an inductor intermittently and rectifies a current flowing in the inductor to generate a current for driving the LEDs, has: a plurality of external terminals each drawing a current from each of a plurality of LED units; a plurality of current sources (CS1 and CS2) connected with the plurality of external terminals respectively; and a plurality of amplifier circuits (11a and 11b) differentially amplifying potential differences between the respective voltages at the plurality of external terminals and a predetermined reference voltage, respectively. A control pulse of the switching element is generated based on an output corresponding to the lowest voltage of the voltages at the plurality of external terminals, among outputs from the plurality of amplifier circuits. <P>COPYRIGHT: (C)2012,JPO&INPIT |
