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DRV8301原理图中



这是官方的 差分检测c相电流,运放做比较,我想问下,在U3B输出1.65V后经R47 到U3A的3脚,而R45相当于接地。是不1.65V是经过分压得到的0.15V进入运放U3A的3脚,实际中我也测得0.15V。怎么能够以1.65V为基准呢?求教。