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请问TPS709的Thermal pad 没有接GND,EN悬空,会导致什么不良情况?

Other Parts Discussed in Thread: TPS709

请问TPS709的Thermal pad 是否必须接GND,芯片设计时为什么不直接连上GND脚?对手册的理解是会影响散热是否准确?TPS70950输出随输入电压增长,当输入5.5时输出4.5,输入6.5时输出5.2。同一板上的TPS70933没有输出,请帮忙分析一下,谢谢!

会是焊接厂家买的芯片有问题吗?