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关于5548输出PWM的问题

Other Parts Discussed in Thread: TAS5548

您好,我用LabVIEW做了一款简单的基于声卡的信号发生器,利用visa将信号源经过USB传给了TAS5548的评估板,直接从PWM输出端接线观察输出的波形,可是PC段无论调整输出信号频率还是其他参数,5548输出的PWM电平基本都是固定的,而且占空比也只是在极小的范围内,差不多是48%到53%左右波动,请问,如果我想调整输出PWM占空比,我该如何设置,谢谢您的解答