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TPS62125 轻载效率<20%,求助!

Other Parts Discussed in Thread: TPS62125

目前在一款9V电池供电的设备中使用TPS62125,降压输出5V,待机状态下输出电流250uA左右,电路使用规格书中首页的典型应用电路。

目前测试DC-DC工作效率只有不到20%,与规格书中80%的效率差距极大(难道TI的规格书也忽悠人?)。

尝试了更换不同感量的电感(6.8uH, 10uH, 15uH, 22uH, 100uH),测试结果基本相同。

请各位大神帮忙看下问题何在,非常感谢!