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您好,
您的电路图是怎样的,可以附出来吗?
可能是选择电感电流不够的原因,电感总是随着电流的增加而减小,在某一点上,电流水平使电感饱和,电感严重下降,就失去了滤波作用。
下面链接是D类功放LC Filter Design应用手册,您可以查看其第4和第5部分电感和电容元件的选择: