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专家们好，
主控TPS5450，24v输入，设计6.5v，3A输出，电感SRR1260-150M，15uH/5.0A/29mΩ，二极管B540C。用功率电阻作假负载，实验的结果，300mA时，电压6.4v正常，1A时，电压降到5.9v，2A多时，电压降到不到5v。请问这正常吗，有什么我做错了。电路图和PCB和输出纹波附图
二极管，40v/5A，应该够了，我再量一下输入电流。 谢谢
