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LM25143: 关于LM25143输出电压不对的现象

Part Number: LM25143

我想用LM25143设计一款24V转12V电路,但是上电输出电压只有0.5V,FB管脚也没电压,量了VCC是5V,没有问题,其他配置和DEMO板区别也不大 不知道什么原因。能帮我分析一下吗