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TPS62840: TPS62840DLCR封装,输出1.8V不正确。

Part Number: TPS62840

芯片手册上

我的原理图:

按原理图电阻参数进行焊接。

VBAT4.2V。

输出为2.1V,而不是1.8V。

请问原因是什么,原理图是否有错。