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TXB108PWR的问题

Other Parts Discussed in Thread: TXB0108

我用STM32F407,接TXB108PWR控制5V无刷电机控制器,3.3V端的PWM方波正常,TXB108PWR输出就不正常了,无法输出低电平。这是为何?

TXB108PWR输出端悬空时,方波正常,接负载就不对,无法输出低电平。

我直接把单片机端(txb108pwr输入端)置低,接电机驱动后,对应输出的无法拉低。