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TPS62745工作不正常

Other Parts Discussed in Thread: TPS62745

TPS62745芯片,按照手册提供的基本电路图连接电路,输入电压5V,4个SEL引脚接地,输出电压会从某个中间值开始不断下降,有时会降到1.8V左右反弹回中间值,之后再次下降,有时会直接降到0,求问原因和解决办法。