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LM8640的放大系数问题



我看到说明文档里面关于输出电压的说明是:检测电阻电压*gain*2,我看了电路图应该是要乘以2,但是不明白的是后面的例子里面好像没有乘以2,而是直接将检测电阻电压乘以放大系数,想问问是到底怎么算输出电压??