STMicroelectronics AEK-LED-21DISM1 LED Driver Board

STMicroelectronics AEK-LED-21DISM1 Digitally Controlled LED Driver Board is designed for high-brightness automotive LED front lighting applications according to the AutoDevKit initiative. The driver board can control four LED strings through two embedded L99LD21 flexible LED drivers with a high-efficiency boost controller and two embedded buck converters.

Each L99LD21 LED driver has a boost controller section that integrates a high current gate driver for an external N-channel MOSFET and delivers a constant output voltage to two integrated buck converters. Two devices can be stacked by the boost controller, allowing dual-phase operation for high-power applications, with an interleaving pattern for improved input current ripple and current load sharing. The buck converter integrates an N-channel MOSFET driven by a bootstrap circuit.

The AEK-LED-21DISM1 LED Driver Board uses SPI communication with an external microcontroller via a 12-pin male connector. The Board also features a special Limp Home mode implemented in the L99LD21 driver that ensures that active communication with the MCU is regularly monitored. The AutoDevKit library extension can be used for the SPC5-Studio development environment to install board firmware drivers that are immediately compatible with SPC5-family MCUs.

The AEK-LED-21DISM1 Digitally Controlled LED Driver Board is ideal for automotive lighting applications, including high and low beams, daytime running lights, turn indicators, position lights, side markers, and fog lights.

Features

Two embedded L99LD21 high-power LED drivers able to supply four independent channels
1.69A max output current per channel
5.5V to 24V input operating voltage range
Protections and diagnostics for output short-circuit and open-load, overtemperature, and battery under voltage