Machine Design

Three-channel LED driver

A three-channel constant-current LED driver with on-chip oscillator, the A6281, executes programmable brightness control.

It is typically used to drive a cluster of red, green, and blue LEDs for one pixel in a large display or a lighting fixture. It precisely controls brightness via 10-bit pulse-width modulation per channel, complemented by 7-bit analog current control per channel to adjust color balance. The device drives up to 150 mA/channel and operates from a supply voltage of up to 17 V. The maximum supply voltage of 17 V allows series strings of up to four or more LEDs on each output. An on-chip voltage regulator supplies internal logic and reduces the number of external components and connections.

Allegro MicroSystems Inc., 115 Northeast Cutoff, Worcester, MA 01606, (508) 853-5000,

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