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TPS56C215: TPS56C215RNNR输出电压一致缓慢上升

Part Number: TPS56C215

hi:

我们用TPS56C215RNNR设计了几路电源,3.3V,5V,1.8V,1.1V,电路如上图所示(不同电压对应的电感值根据datasheet推荐有所变化)。

奇怪的是1.1V可以正常工作,但3.3V,5V,1.8V电源输出一直在缓慢上升,以3.3V为例,上电后输出3.2V,然后慢慢上升3.3,3.4,3.5我只能切断电源。其中FB电压我测试过一直为0.6V不变,请问这可能是什么问题。