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详细请见该芯片的pdf说明文件，我打算直接应用该芯片的说明书里的典型电路和印制电路板，我有款电机无需对速度进行控制，那么PWM输入第十脚空置可以吗？还有那个单层电路板上标记为D1的是什么元件？在典型应用原理图里没这个啊，请尽快回复我下 ，谢谢！
