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请教有关TPA3112的问题



最近做了块TPA3112的板子,但连接后没声音,当手指触摸到几个引脚后会正常工作,一旦离开,就停止工作。TPA3112芯片的底部有接散热片的地方,手册上说它要接电源地,在底下不好接,我就没接。之前的的现象是不是它底部没接地的原因?