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PTH08T220WAZ的输出为何高?



电源芯片PTH08T220WAZ,正常输出1V。但我的电路此芯片的输出是1.4V.(按照DATASHEET上的典型电路进行焊接测试)。请给出原因?是假芯片吗?还是某个地方连接不对。