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Part Number: TCA9803

Hi experts,

  我设计中采用了TCA9803这颗芯片,但输出端B的低电平低不下去,会有个六百毫伏的电压,电路图和波形图如下所示,请问可能是什么原因导致的呢,可以怎样优化?谢谢!