| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a drive circuit capable of driving a plurality of light emitting elements with high efficiency, and to provide an electronic device. <P>SOLUTION: A plurality of LED terminals 106a-106c are respectively provided for a plurality of LEDs 2a-2c, and anodes of the corresponding LEDs are connected. A boosting circuit 10 boosts an input voltage Vbat. A plurality of constant current sources 12a-12c are respectively provided on the plurality of the LEDs 2a-2c, and one ends are connected to the corresponding LEDs 2a-2c through the LEDs terminals 106a-106c. A plurality of switches 14a-14c are respectively provided for the plurality of the constant current sources 12a-12c, and selectively output either one of the input voltage Vbat or an output voltage Vout of the boosting circuit 10 with respect to the corresponding constant current source 12. A control circuit 20 monitors voltages Vled_a-Vled_c of the plurality of LED terminals 106a-106c separately, and controls a connection state of the corresponding switch 14 based on the respective voltages. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
