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TPS73701DRB输出电压过大问题

Other Parts Discussed in Thread: RM48L530

在设计中3.3V-1.2V电路使用如图所示TPS73701DRB电路

在调试中发现刚上电时1.2V输出为1.21V,但经过约30秒,输出会上升到1.26V,在过一段时间会超过1.3V。请问是什么原因?