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TPS54560带载能力有问题

Other Parts Discussed in Thread: TPS54560

 各位大神您好!我在做一个输入42V输出5V的DC-DC电路,输出电流想得到2A的,但是我用10V输入时,带2.5欧的纯电阻,电流上不去,最高在0.5A左右,电压也掉下来了,我采用的是典型电路,参数基本上一致的,请问这是什么原因啊?用的不是PCB板,麻烦各位解囊,谢谢哈~~~~