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搭建了一个5V和3.3V的双向电平转换电路，如图显示，调试过程中发现3.3V被拉高到3.9V，断开EN控制脚后，电压恢复正常的3.3V，5V供电电压正常，请问问题出在哪里？
您好，
EN管脚和Vref_B管脚需要经200KΩ电阻后接电源，请查看下面链接LSF工作原理：
https://training.ti.com/tlm-lsf-bias?context=1134826-1139264-1134790
