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LM2663: LM2663在方块开关电源供电下,上电瞬间发烫烧坏原因

Part Number: LM2663

电源拓扑是DCDC(同步整流)将24V转为5.5V。然后LM2940IMP-5.0将5.5V转为5V,然后LM2663将5V转为-5V,使用明纬的方块开关电源上电瞬间LM2663就会发烫,使用稳压电源就不会,这是为什么?谢谢。