| 摘要 |
An LED lighting device includes: a resistor R1 configured to output a detection value of an inductor current I1 flowing through an inductor L1 during an ON period of a switching element Q1 ; a threshold generation section 42 configured to generate a threshold value Vs of the inductor current I1 corresponding to a dimming level; and a switching control section 44 configured to control the switching element Q1 to turn on and off. The switching control section 44 is configured to determine an OFF timing of the switching element Q1 based on comparison between the detection value and the threshold value Vs of the inductor current I1 . The LED lighting device increases a period of a switching cycle of the switching element Q1 with decrease of the dimming level. |
