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关于TPS62125反相降压器的疑问?

Other Parts Discussed in Thread: TPS62125

看了TPS62125反相降压器的datasheet,里面怎么没有方向电压的计算公式啊,求助!如果是得到-7V的电压,输入信号时+7V,那么RFB1和RFB2的电阻取值该如何选取啊?PS: TPS62125 用于一般的DC/DC降压时有输出电压的计算公式