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关于LM5117的重要紧急问题,望指教!谢谢!

Other Parts Discussed in Thread: LM5117

LM5117作为稳压器的核心器件,空载时输入电压16V,输出电压5V,为什么接入负载之后输入电压16V,但是没有输出呢?是哪里有问题?是对LM5117没有彻底了解透吗?以下附件是我们的电路图,望指教,不胜感谢!