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TPS65135,输入用USB口直流供电,输出电压不正常

完全按照参考设计

  1. EN直接接电源(5.4v)了,
  2. PIN4(VAUX) 和 PIN5(GND)直接接了模拟地
这样就会导致空载输出电压如下吗:
VP=0v
VFB=0.12v
VFBG=0.21v
VN=0.4v
IFB = (0.21-0.12)/R2 = 0.09/120k = 0.8uA
R (VP-GND) = 1M ohm
请问这是什么原因?