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Thursday, June 9, 2011

National Semiconductor intros industry's first 2A, single inductor, RGB LED driver for portable projectors

SANTA CLARA, USA: National Semiconductor Corp. has introduced the industry's first 2A red, green and blue (RGB) LED driver for portable projectors that drives three common anode RGB high-brightness LEDs sequentially with a single inductor. The highly-integrated LM3435 includes an I2C control interface for LED current control.

A basic portable or pocket projector LED design today includes a separate driver for each red, green and blue LED and each circuit requires an inductor. The design is bulky and costly, consisting of multiple components to accurately drive the LEDs. The growing popularity of pocket projectors, often smaller than a common two and a half inch portable hard drive, poses increased space constraints.

A single LM3435 LED driver from National solves the problem by driving three RGB LEDs sequentially, powering one after another at 60 Hz and above to match the operation requirements of the latest liquid crystal on silicone (LCoS) or digital light processing (DLP) image devices. The much simpler, compact design requires just a single inductor and a few passive components alongside the driver.

National's LM3435 LED driver joins National's family of high-brightness projector drivers that include the LM3433 and LM3434 with high frequency dimming and LM3549 0.7A sequential-mode LED driver.

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