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TPA3221: TPA3221功放,在低温-20℃时,拔电重启或者插拔一下AUX-IN后,出现持续杂音

Part Number: TPA3221

  补充我们的调试步骤:产品在做低温试验,第一目标做-20度,等低温箱温度降到-10度的时候拔插AUX_IN线,没问题;等低温箱温度降到-15度的时候拔插AUX_IN线,没问题;等低温箱温度降到-20度的时候拔插AUX_IN线,杂音就出现了;断开被测机器的电源等约10分钟后重新上电,依旧有杂音,将温度调至-15度,依旧有杂音,将温度调至-10度,依旧有杂音。以下是设计原理图