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LM3405芯片FB管脚输出电压为0是怎么回事

Other Parts Discussed in Thread: LM3405

使用LM3405作为高亮二极管的驱动电源,按照评估板连接电路,用万用表测量发现FB管脚没有所说的205mv电压是怎么回事呢,VIN为5V,VIN与EN之间连接100K电阻,测量得EN脚电压值为4.5V左右

x 出现错误。请重试或与管理员联系。
x 出现错误。请重试或与管理员联系。