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L7981 Datasheet Discrepancy

Question asked by bleloch.david on Mar 5, 2014
Hi, I've started a new design using the L7981A and can't get the thing stable despite copying the reference layout.   The datasheet is not consistent with regard to the feed forward constant 1/K.  In Equation 15 it's defined as 13 yet in Equation 21 it's 9.  Which value is it please, this has a bearing on the resistor values required in the compensation loop.  Thanks