The LB4 family of chips support a Current Control dimming methodology that leads to higher efficiencies. This takes advantage of the higher lumen/watt efficacy that LEDs show at lower current levels. For more information please read our white paper "Linear vs PWM".

The LB4 family of chips can use one, two, three or all fourof its outputs to control multiple channels of LEDs and provide smooth, seamless dimming from any input, including triac dimmers.

The main difference between the LBT approach to triac dimming control is a software approach is used to interpret the triac signal. This allows for non-linear relationships, similar to incandescent lamps, to be generated.

Using our built-in correction functions and a choice of calibration options, the LB4 can compensate for a variety of factors to maintain a specific color point.

LEDs vary in terms of luminous output and chromaticity under both Current Control and PWM dimming methodologies (see "Spectral and Luminous Efficacy Change of High-power LEDs Under Different Dimming Methods," SPIE Proceedings 6337). The LB4 family of chips will adjust for these shifts to mai1ntian color and brightness in multi-LED systems; or maintain luminance in single LED systems.