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LM25118输出不正常。。。只输出很小电压

Other Parts Discussed in Thread: CSD17306Q5A

我按照数据手册28页电路图画的,MOS管用的CSD17306Q5A。。。二极管用的两个SS34并联,不知道什么原因输出电压总是很小,反馈脚电压很小,而且随着输出电压的变化而变化。求指导。。。