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TPA3136D2: 3136

Part Number: TPA3136D2

各位大神您们好

   请教一个问题,用的是TPA3136典型应用电路,只不过是非平衡的单端输入,12V供电,4欧5W输出,在喇叭后面用的是RC滤波(100R+47nf),不过示波器测出来的波形是这样的,波形异常,展开后发现是和功放开关频率一样的噪声叠加在上面的,请问我可以从哪几个方面寻找问题,谢谢!