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关于LTM4644其中一路没有输出的问题!!

Other Parts Discussed in Thread: TPS65400

自己设计的板子,用4644供电,用到前3路,每路使能均由FpGA控制, INTvcc接pGooD,中间有4、7K电阻, 现测试发现,前两路输出正常,第三路无输出, 经测量第三路使能正常3、3V,pGooD没有输出,这是怎么回事?从哪里能测出有问题呢? COMP不接,MoDE接地,TRAck接电容到地!