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TPS54329输出异常

Other Parts Discussed in Thread: TPS54329

你好,我现在设计制作的电路中,有一部分需要12V转5V。于是我用TPS54329设计了以下电路,可做好样片后,测量得到芯片各个脚输入输出均正常,除了本应输出5V的一路输出只有0.765V,请问各位是什么原因,万分感谢!在此附上原理图及PCB图。