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TPS5450压降过大



我按照手册中的参考电路做的设计:

输入电压12v,输出5v,但接入负载后,输出变成4.5v了,实际测试电流为0.2A

这个是正常的么?如果不正常应该怎么修改呀?我们这个最大负载电流大概为2A,有没有参考设计。

感谢大拿。