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LED超稳定电源的选择?

    想做一个恒定LED光源,希望它的光强波动在0.1%以下,开始使用开关电源给LED供电,但是用光电二极管检测光强时发现LED发出的光带有开关文波,而且光强会波动。后来想用LDO作为电源,但是找不到能提供3.3V-3A的LDO,有哪位大神可以指导一下?