2A RGB LED Driver for Portable Projectors

National Semiconductor has introduced a 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 single LM3435 LED driver from National drives 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 range of high-brightness projector drivers that include the LM3433 and LM3434 with high-frequency dimming and LM3549 0.7A sequential-mode LED driver. National will demonstrate the LM3435 at the Guangzhou International Lighting Exhibition in Guangzhou, China, on 9-12 June.

National's LM3435 RGB LED driver is a highly integrated, compact switching-mode constant-current regulator that drives three LEDs in sequential mode with a single inductor. The LM3435 integrates all active components, including an N-Channel main MOSFET, P-Channel synchronous MOSFET and three N-Channel pass switches for individual LED control.

It accepts input voltage from 2.7 to 5.5V to drive constant current pulses to each red, green and blue high-brightness LED sequentially. The level of current pulses is individually programmed linearly for 1,023 steps through an I2C interface. The maximum level of the current pulse can be set by three external current setting resistors to ground from 0.5 to 2A respectively. The non-isolated flyback converter with synchronous rectification ensures buck-boost operation at high efficiency.

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