汽車級LED和設(shè)備驅(qū)動程序可能需要額外的保護(hù)外部照明

　　即使汽車級LED和LED設(shè)備驅(qū)動程序可能需要額外的保護(hù)時，在惡劣的外部汽車照明應(yīng)用的電氣環(huán)境中使用。高可靠性是最重要的，特別是作為前方和后方面對燈光發(fā)揮了重要作用，在新的車輛安全功能，可能會導(dǎo)致在某些方面的關(guān)鍵情況下的自主控制。

　　本文將考慮如何LED驅(qū)動IC可以防止短路和其他故障條件與額外的電路組成的更高度集成的設(shè)備，包括診斷和保護(hù)功能。將參考汽車級LED驅(qū)動器從線性技術(shù)，電流檢測從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）.