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TPS65023: 电源芯片输出异常

Part Number: TPS65023

你好,这块芯片焊上去之后,ldo的3.3v与1.8v以及第二组电源输出VDCDC2设置为输出1.8v都是正常的,但是VDCDC1设置为1.2v时电压不够甚至为0v,VDCDC3的输出设置为3.3v,但实际是负的1.8v,请问这是什么原因。