National unveils first 2A RGB led driver

The LM3435 drives three common anode RGB high brightness leds sequentially with a single inductor and includes an I²C control interface for led current control. National claims it offers a simple, more compact design compared to basic portable or pocket projector leds. The device 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 1023 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 2.0A respectively. The non isolated flyback converter with synchronous rectification is designed to ensure buck boost operation at high efficiency.