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LM3478基准电压是不是1.26V，那反馈脚FB测得25V是怎么回事？
楼主，按照datasheet，LM3478的FB引脚电压就是1.26V，你现在测得25V，很可能是芯片已经损坏了。按照官网上的参考电路图连接，换个芯片 再测试一下。另外，注意一下输入电压不要超过LM3478的最大耐压值。
