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In the datasheet of LM20146 in page 16 there is a equation for calculating the value of resistor Rt. But it didn't make any sense, when i giving the lowest switching frequency and highest switching frequency it will always giving the negative values in the range of -54.... Only the values after the fraction is changing. When i using the WEBENCH it is showing resistance in the range of k. So what is the correct equation to find value of Rt
