A6278ELWTR-T集成电路（IC）的LED驱动器规格书PDF中文资料

A6278ELWTR-T属于集成电路（IC）的LED驱动器。由Allegro MicroSystems制造生产的A6278ELWTR-TLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。

描述 Description

The A6278 and A6279 devices are specifically designed for LED display applications. Each of these BiCMOS devices includes a CMOS shift register, accompanying data latches, and NPN constant-current sink drivers. The A6278 contains 8 sink drivers, while there are 16 in the A6279.

The CMOS shift register and latches allow direct interfacing with microprocessor-based systems. With a 3.3 or 5 V logic supply, typical serial data-input rates can reach up to 25 MHz. The LED drive current is determined by the user’s selection of a single resistor. A CMOS serial data output permits cascading between multiple devices in applications requiring additional drive lines. Open LED connections can be detected and signaled back to the host microprocessor through the SERIAL DATA OUT pin.

Features and Benefits

▪ 3.0 to 5.5 V logic supply range

▪ Schmitt trigger inputs for improved noise immunity

▪ Power-On Reset (POR)

▪ Up to 90 mA constant-current sinking outputs

▪ LED open circuit detection

▪ Low-power CMOS logic and latches

▪ High data input rate

▪ 20 ns typical staggering delay on the outputs

▪ Internal UVLO and thermal shutdown (TSD) circuitry