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TPS54531电压升高

Other Parts Discussed in Thread: TPS54531

用TPS54531设计一个电源,24V输入3.8V输出5A,在用电子负载测试时电压很稳定,但是给手机板供电(手机板从开机开始电流都是变化的,电流小于1A)这个时候电源就开始变化变到3.96V 4.05V 4.10V 4.37等,用示波器测试芯片第8脚发现波形不是和没有带负载时差不多,只是有很长一段时间没有波形,也没有可以调整的地方,是适应负载能力不行还是其他原因?请推荐合适的芯片,谢谢!