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TPA3139D2: plimit调节音量效果不大

Part Number: TPA3139D2

如题,使用可调电阻0~50K调节PLIMIT端的电压,用万用表测可以正确从0~5V变化,但是输出的音量只有在接近0V或者5V的时候才有比较明显的变化,其余的电压音量变化很不明显,请问有大佬知道是什么原因嘛?