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求推荐一款升压LED恒流驱动芯片

Other Parts Discussed in Thread: TPS61500

输入能力5V 2A (移动电源供电)

LED 2串以上(无论几串,最终总功率6W,比如2串LED压降6V,那电流1A,总功率6W)

要求效率尽量高,最好能在90%以上,另外如果保证输出6W功率的情况下几串效率最高?