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TPS61222

大家好,用了tps61222芯片,电感和电容选用的都是推荐型号:电感4.7uh  电容陶瓷10uf ,输出在没有带载的情况下是5v,负载10mA的时候直接拉到3.0伏左右,各位帮忙指导一下原因。电感 电容都换过还是不行