Two 16-Channel LED Driver ICs for Display Applications

Description

Allegro MicroSystems, Inc. announces the release of two new LED driver ICs for use in displays, signs, and control panels.  The A6282 and A6285 both have 16 constant-current output channels. They have serial data inputs and outputs, which can be cascaded to create large, megapixel text or video displays. They can also be used in smaller applications such as LCD backlighting or controlling LEDs in an instrument or control panel.

Both the A6282 and A6285 operate with LED supply voltages up to 12 V, which allows stacking of three or more LEDs per channel. Logic supply voltage can range from 3.3 V to 5 V, in many cases allowing the device to be powered from the same supply as the LEDs it is driving. Users can adjust the brightness of LEDs controlled by both devices by pulse –width modulating their output enable inputs. Both devices feature protections such as undervoltage lockout (UVLO) and thermal shutdown. The devices are available in a selection of surface-mount packages.

The A6282 is a basic 16-channel driver. Each output can drive up to 50 mA.    Its excellent channel-to-channel output current matching of ±3% ensures high-quality displays and is improved over several alternate sources.
 
The A6285 has additional features that enable it to be used in video applications. Dot correction allows the user to adjust each channel’s output current to compensate for initial device mismatch and LED aging. Internal pull-ups provide fast turn-off times, eliminating ghosting and improving picture quality for moving images. To minimize radiated EMI and noise on the supply lines, the A6285 outputs have staggered turn-on times. The A6285 features Open LED detection, which allows remote diagnosis of failed LEDs.

Specs

* 16 constant-current outputs, up to 50 mA each * LED output voltage up to 12 V * 3.0 to 5.5 V logic supply range * Schmitt trigger inputs for improved noise immunity * Power-On Reset (POR), all register bits = 0 * Low-power CMOS logic and latches * High data input rate: 30 MHz * Output current accuracy: between channels < ±3% and between ICs ±7%, over the full operating temperature range * Internal UVLO and thermal shutdown (TSD) circuitry
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