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请教 单节18650电池供电,驱动CREE单颗LED的大电流战术手电筒方案(三档调光+爆闪+SOS),需要最高的转换效率(可高成本)

请教 单节18650电池供电,驱动CREE单颗LED的大电流战术手电筒方案(三档调光+爆闪+SOS),需要最高的转换效率(可高成本)