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DRV8870: 不能驱动电机

Part Number: DRV8870

外部条件:原理图设计和手册要求一致,电流限制为1.3A,使用8KHz PWM 85%~100%占空比驱动IN1,IN2低电平。

驱动一个直流有刷电机,如果驱动线比较短(15cm),运行比较正常(速度30RPM),稍微加长几个cm,电机速度就变为几乎不动了,测量OUT1波形,发现只有大约20us为高电平,正常应该有100us高电平,不知道为啥会这样。