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TPS562209输出不稳定问题



我焊了一块板子,要求输入12V,输出+5V,空载测量输出电压,电压一直不稳定,只有1点几伏,还在变化,不知道是什么原因引起的,头大了,请问有哪位朋友知道怎么回事吗?