Sundar Sundararaj is an applications engineer with Integration Associates Inc., Mountain View, Calif. He holds a BSEE from DDIT, Nadiad, India, and an MSEE from Arizona State University, Tempe. Email address: sundar@integration.com Web site: http://www.integration.com
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September 25, 2008[Ideas For Design] Simple Ambient Light Sensor Controls White LED Driver
This idea describes a white- LED (WLED) driver circuit controlled by a simple ambient light sensor (ALS). A typical application would be a brightness control for cell-phone backlighting. On a very sunny day, the brightness will increase to improve the visibility. The circuit uses the IA2505 four-channel WLED (Fig. 1). Each LED can be driven up to 20 mA, with the drive current...
