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使用TPS62140A DCS 控制系统的 3-17V 2A 降压转换器 遇到不稳定因素的问题 求TI大神解答!

Other Parts Discussed in Thread: TPS62140A, TPS62162

我们选用TPS62140A

要求输入电压范围:3.6-10V,输出3.3V 1.5A,静态电流20uA左右。 

按规格书是没有问题,但实测样品,现在就有点问题,请求大神们解答一下。 感谢!!!

现在输入电压低于4.0V,电流马上升到7.3mA

静态电流,有时22,大部分时间29

如何达到我们需要的效果呢?