高功率白光LED驱动器工作在1或2节碱性电池

摘要：一个DC-DC升压转换器为基础的白光LED驱动器上运行一个或两个碱性电池，电压低至0.8V时开始。

Maxim > App Notes > DISPLAY DRIVERS POWER-SUPPLY CIRCUITS

Keywords: white LEDs, current source, stepup converter, boost converter Mar 23, 2006

APPLICATION NOTE 3755
High-Power White-LED Driver Operates on 1 or 2 Alkaline
Cells

Abstract: A white-LED driver based on a DC-DC step-up converter operates on one or two alkaline cells, and starts with
voltages as low as 0.8V.

Replacing incandescent bulbs with high-power white LEDs yields higher reliability and greater luminous efficiency. A direct
connection between the LED and battery, however, is not ideal. Compared with the alkaline batteries used in most portable
applications, a power source for white LEDs should act more like a current source and offer higher operating voltages. It
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