Allegro MicroSystems 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 devices 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 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 and thermal shutdown.
The A6282 is a basic 16-channel driver. Each output can drive up to 50 mA. Its channel-to-channel output current matching of ±3% ensures high-quality displays.
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 gain. Internal pull-ups provide fast turn-off times, eliminating ghosting and improving picture quality for moving images. To minimise radiated EMI and noise on the supply lines, the outputs have staggered turn-on times. The A6285 features Open LED detection, which allows remote diagnosis of failed LEDs.
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