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TPA3118D2的高频失真问题

最近在设计一款产品,用的TPA3118,PBTL模式,BD模式,400KHZ工作频率,35W 4 OHM,线路如下,发现高频失真比较大,特别是6K-20KHZ,THD有1%左右,我们客户要求要小于0.5%,调试了好久,都搞不好,请问下TI工程师,这个IC在20-20Khz的频段的失真曲线以及如何改善,谢谢!