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TPS562200DDC 3.3V输出不正常



VFB引脚,测得电压为0.8V或以上,最后实际输出为3.4V-3.5V。

一共焊了9个板子,都是这样。请教那里可以改进。。

把33.2K(33K+200R)换成可调电阻,可以实现电压可调吗?

这个原理图是别人抄给我的。应该没啥问题啊?难道是芯片有问题??

以下是PCB布局。难道是布局有问题?