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驱动24W小功率电机，用DSP芯片输出六路PWM信号，PWM信号接UCC21521（隔离栅极驱动器），输出4A拉电流，是否可以不用接六个场效应管，也就是全桥电路，而直接连接电机，因为输出电流已经够用了
