| 摘要 |
An LED lighting device may include a first constant current source, a switched mode power supply, a plurality of LEDs between the switched mode power supply and the first constant current source, and powered by the switched mode power supply, and a voltage divider between the switched mode power supply and the plurality of LEDs. In various embodiments, the voltage divider may include a plurality of switches. Each switch may be configured to transition between open and closed based on a lighting state of an LED of the plurality of LEDs to vary a divided feedback voltage provided to the switched mode power supply. In various embodiments, the switched mode power supply may be configured to supply different output voltages based on the divided feedback voltage. |
