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求指导TPS40140不能加负载的

你好,最近焊了一块开关电源。。。终于把5V和0.9V都出来了。5v接上负载没问题,当0.9v接上负载后,0.9v和5v都不能正常工作,0.9v直接变成了0v,5v则由5v指数下降到0v,然后又从5v下降到0v。。。不知道怎么入手了,求指导。。。。感激不尽