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tps54308的调试问题

Other Parts Discussed in Thread: TPS54308

电路焊接完成后,接通电源16.2V,TPS54308的VIN是16.2,EN悬空,输出端SW输出0.07V,本应该输出5V的不知道为什么,而且FB引脚电压是0.05V,按电阻分压原理不应该是这么多的。不知道哪错了