汽车级LED和设备驱动程序可能需要额外的保护外部照明

　　汽车级LED和设备驱动程序可能需要额外的保护外部照明

　　即使汽车级LED和LED设备驱动程序可能需要额外的保护时，在恶劣的外部汽车照明应用的电气环境中使用。高可靠性是最重要的，特别是作为前方和后方面对灯光发挥了重要作用，在新的车辆安全功能，可能会导致在某些方面的关键情况下的自主控制。

　　本文将考虑如何LED驱动IC可以防止短路和其他故障条件与额外的电路组成的更高度集成的设备，包括诊断和保护功能。将参考汽车级LED驱动器从线性技术，电流检测从TI。

　　Adaptive lighting

　　Virtually any new model of car on the market today will contain LEDs， for exterior or interior lighting， or both. It’s not only their low power， long life and high efficiency that appeals; nor is it solely their flexible form factor that has brought ‘concept car’ style lighting clusters and bodywork design to the family runaround. The ability to integrate LEDs easily with sensors and electronic controls is one of the most compelling reasons. It is key to advanced driver comfort and safety features， such as adaptive lighting， automatic dipping， object detection and parking aids.

　　For adaptive lighting multiple LEDs are integrated into a cluster or matrix such that individual LEDs can be turned on and off or dimmed to produce the light output appropriate to conditions. External sensors on the car detect not only changing ambient light levels due to weather conditions or nightfall， but also physical characteristics such as corners and oncoming headlights， so that the beam width and projection can be adjusted automatically （Figure 1）.