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LMR14006: LMR14006输出带载能力未达到标称值

Part Number: LMR14006

最近在设计电路时采用了LMR14006YDDCR这款芯片,打板回来后出现了轻载工作正常(<50ma左右),重载输出能力变差(>50ma降压并震荡)的现象,电路设计及PCB设计如图,请大神分析一下原因。原理图中实际使用的续流二极管为1N5819。