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TPS54336A改负压无输出

Other Parts Discussed in Thread: TPS54531, TPS54336A

以上是我的原理图,

之前我用过TPS54531改负压,输出负压没问题,但是带负载的时候会掉压(正常输出正压也会掉,空载和带载会下降0.1V,

带载趋于稳定,但电流越大下降约厉害,最大降0.2V)

听别的工程师说用同步的芯片会好一些,所以现在改用TPS54336A,但用这个芯片做出来发现没有输出,理论来说应该是输出-9.7,

但现在只有-0.4V,不知道是哪里有问题,希望TI能帮忙解答一下,感激。。