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我想请教几个关于DC-DC电源芯片LM2593HVS-ADJ的几个问题

我现在使用LM2593的效率较低(83%,36V转28V),我想咨询一下,造成这个结果的原因?  还有就是这个芯片的输入电容一定需要几百uF才行吗?输入电容小了会用什么影响?输出ESR为多少毫欧比较合适?