Constant-Current LED Drivers

内容简介

LEDs are current-driven devices that require current limiting
when driven from a voltage source. In most applications,
it is desirable to drive LEDs with a constant-current source.
The current source is used to regulate the current through
the LED regardless of power supply (voltage) variations or
changes in forward voltage drops, VF , between LEDs.
The devices in the Allegro® MicroSystems A62xx family of
LED drivers are optimized for LED display-driving applications,
lending cost-effectiveness and compactness to the
solution. The family includes the A6275, A6276, A6277,
A6278, and A6279 devices. These feature both 8-bit and
16‑bit versions, and are available in standard plastic DIP,
SOIC, MLP (A6279 only), and TSSOP packages.
The A6275, A6276, A6278, and A6279 can provide a maximum
of 90 mA per output, and the A6277 can provide a
maximum of 150 mA per output, making them suitable for
various large display applications such as scoreboards and
gaming equipment.

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