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DRV8833: 输出波形问题

Part Number: DRV8833

无负载电机时,AIN1端输入0V,AIN2端输入20KHZ,占空比40%,幅值3.3v的方波。如下图所示

图中黄色为AOUT2波形,蓝色为AIN2方波。为什么黄色输出有电容效应,缓慢下降?