There seems to be a bug/error in Webench for a negative DC-DC design using the LM25005. In my Webench design Cramp=56pF and L1 = 22uH. According to the data sheet, Cramp should equal 10^-5 * L1, so should equal 220pF.
With Cramp = 56pF, I am not getting anything like the current from the supply. Having spent the day checking the design, pcb layout, replacing the LM25005 etc., I finally thought I'd better read the data sheet. Replacing Cramp with 220pF solves the problem.
Nick
