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TPA3251 18,19,21脚位悬空可以工作吗，是加低电位，还是高电位，加高电位是多少V。
可以, 开漏输出, 可以接上拉电阻
后面两个是输出引脚, 不影响其工作, 只是你不知道异常了
18脚加12V可以工作吗。我看见都是加的3.3V
