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TPS65130: 关于TPS65130芯片5V输入正负12.3V输出问题 负压无输出

Part Number: TPS65130

参考TPS65130数据手册设计的电路通电后发现正电源输出正常,负压输出为0,其中FBN引脚为0,VREF为1.2V,4号脚电压正常

原理图如下

PCB布局如下:

希望各位大佬帮忙看下问题所在。补充芯片无发热,输入电流正常