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LED drivers feature 16 constant-current output channels

Posted: 22 Jan 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LED drivers? LCD displays? control panels?

A6282 and A6285

Allegro MicroSystems Inc. has announced 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 12V, which allows stacking of three or more LEDs per channel. Logic supply voltage can range from 3.3V to 5V, 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 50mA. Its excellent channel-to-channel output current matching of 3 percent 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 again. 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.

The A6282 is available in 24-lead surface-mount packages: QFN, SOIC and TSSOP. The A6285 comes in a 32-lead QFN. Samples of both devices in all packages are already available.




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