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TPA3116 正弦波测试输出波形

TPA3116 输入正弦波,测试输出波形,输出负载为4欧姆功率电阻。供电21V电流3A电源供电。输入600mV时出现以下失真: 输入500mV,输出信号正常,正常波形如下

为什么会出现这样的失真?是因为功率电阻与扬声器的阻抗不一样吗(扬声器配合如贝尔电路不失真,功率电阻配合如贝尔电路失真了?)?电路是按照评估板设计的,参数和评估板是一样的