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TPS61040升压问题

我按照芯片资料说明书里的18V电路搭建简易测试电路,当输入为3.3V时,输出8V;输入5V时,输出11V;

按道理说不是应该输入一个电压范围,输出都是18V吗,而且现在电路输出达不到18V

请问这是哪里出了问题???求指导呀

电感我是随便买的,10uh,1A的;