| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply circuit capable of emitting a light-emitting element at predetermined luminance independently of temperature.SOLUTION: A switching power supply circuit 10 converts an input voltage and supplies a driving voltage to a plurality of loads 300. The switching power supply circuit 10 includes an inductor 20, a first switch 30, a second switch 40, a capacitor 50, a current detection unit 60, and a switching driving unit 90. The first switch 30 charges/discharges the inductor 20. The second switch 40 is connected to respective loads 300. The current detection unit 60 detects a current flowing into the loads 300. At least one of the loads 300 connected to the current detection unit 60 is an LED 300b. The switching driving unit 90 switches the first switch 30 and the second switch 40 so that the current flowing into the LED 300b becomes a predetermined target current. |
