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tps51116过一段时间后1.8V电压无法输出

Other Parts Discussed in Thread: TPS51116

各位大神好

做了一块板子,自己焊接,用的是TPS51116芯片,焊接完成后测试1.8V电压可以正常输出,但一天后测试发现1.8V瞬间输出然后拉低为0,过段时间后测量又可以输出,一会后又不能输出,表现出输出情况不稳定的现象,请问这可能是什么原因造成的?

附:电路图如下,参考的spartan6 ddr2供电的1.8V输出电路图