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LM3414的使用



电路图和器件选择大致如上,LED选择的是CREE XPE3W白色LED。DIM引脚为了调试方便,串接1k欧姆电阻后上拉到为5V。电路搭好后,LED没有亮,VCC的电压测得为3.74V;VFS的电压并不稳定在1.255V,有时会跳到0.5V左右;LED两端的电压大约为1.74V。请帮忙分析一下问题是什么,有没有可能是芯片的问题。