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TPS55340输入等于输出,什么原因?

Other Parts Discussed in Thread: TPS55340

TPS55340输入等于输出,测量FB、SW都没有波形。好像芯片没有工作,什么原因呢?

输入电压从4V到7V都试了,都不行。EN引脚直接接输入了。

帮看下,多谢!