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TPS560430芯片有adj可调输出版本和3.3V固定输出版本，datasheet中没有说明选择TPS560430X3F固定输出3.3V时，FB引脚该怎么接，是接地？接输出？悬空？上拉？下拉？
请问能找到依据吗？TPS61240手册里固定输出版的FB是接输出，TPS62172手册里的FB是接地，而这颗芯片的手册里压根就没有提到诶
