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防止短路和开路的LED串保护
在广泛的室内，室外和汽车固态照明应用的LED串的使用越来越多的注意力集中在需要确保可靠性和安全性。保护瞬态和过压/欠压条件下的损害是解决方案的一部分。另一个方面是设计灯具，这样，如果一个设备故障，打开电路，该系统可以补偿和维持一个令人满意的光输出。
虽然户外应用特别脆弱，在汽车领域电路保护是一个安全关键问题。最佳的解决方案将在很大程度上取决于所选择的拓扑结构，并选择最合适的LED驱动器，它本身可能取决于应用程序的性质。
This arTIcle will outline some of the many device and topology opTIons available. It will further consider the efforts made by LED driver manufacturers to incorporate features that protect against damaging condiTIons and ensure conTInued safe operation with both open- and short-circuit LED strings.
Specific reference will be made to a number of the wide range of drivers available from Texas Instruments， Linear Technology and ON Semiconductor. Specific parts include TI’s LM3431 and LM3466 linear current controllers， Linear’s LT3795/6 DC/DC LED driver and ON Semi’s NCV7680 current controller， aimed at automotive and general-purpose lighting.
Finally， this article will highlight the latest in the PLED range of open LED protection devices from Littelfuse.
