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LMZ输出不对,输入电压被拉低

Other Parts Discussed in Thread: LMZM23600

请问我用webench在线设计的电路,输出电压6V。FB电阻计算也应该是对的,调试时将EN引脚和SS引脚的阻容也尝试去掉。但实际输出电压却在6.6V。电源输入12.8V的电压也被拉低到了11V。这是为什么呢,看手册PCB布局也很容易的啊