数据手册中提到，SHDN引脚接地（低电平），芯片不工作，输出应该为0才对，电路VDC=10.8V，输出3.3V
当前出现的问题是，我直接将SHDN引脚接地，出现的情况是输出电压在1.9-3.3V之间变化
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