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ucd7100的设置ILIM问题

Other Parts Discussed in Thread: UCD7100

用UCD7100驱动反激拓扑中的mos管,主要是利用可编程的电流上限功能,手册里面的说是可以设置ILIM的阈值在0.25v到1v,但是如图给出的ILIM=0.25V的时候,后面是0.23mv,而ILIM=0.75v的时候是0.725V,这跨度有点大啊?ILIM是和CS的电压比较,但是0.23mv到0.725V这范围是不是太大了,我的CS采样频率最高450KHZ,但是精度不可能到1mv以下啊,请教各位是怎么应用的