TI LM3466多路智能LED驱动器设计方案

TI公司的LM3466是多路LED系统的智能线性LED驱动器,它能自动均衡每路LED的电流,容易预设和细调LED串间的电流,室温下的电流精度±1%,温度范围内的精度为±1.5%,如果某串LED开路,能维持不变的输出功率,输入电压从6V到70V,主要用在街道照明和固态照明系统.本文介绍了LM3466主要特性,方框图, 照明系统应用电路图以及LM3466评估板参考设计电路图,材料清单和连接框图与PCB元件布局图.

LM3466 Smart Linear LED Driver for Multi-Channel LED Systems The LM3466 integrates a linear LED driver for lighting systems which consist of multiple LED strings powered by a constant current power supply. It equalizes the current provided by the supply in a pre-set ratio for each active LED string, where an active string is a fully turned on LED string, regardless of the number of strings connected to the supply or the forward voltage of each LED string. If any LED string opens during operation, the LM3466 automatically equalizes the supply current through all of the remaining active LED strings. As a result, the overall brightness of the lighting system is maintained even if some LED strings open during operation.
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