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Other Parts Discussed in Thread: TPA3140D2
供电正常，1脚和2脚也使能了。
TPA3140D2 是一款高效的 D 类音频功率放大器
1脚使能是接高电平, 2脚是个故障输出脚
另外, 电源有多个引脚, 特别是有个 FET 用的电源, 特别留意一下
GVDD（High-side FET gate drive supply. Nominal voltage is 7V. Also should be used as supply for LIMTHRES limit function）这个引脚 有7V 的，是正常的，就是没有音频出来，不解。
輸入是什麼
