Hello,
Thank you for your interest in Texas Instruments' power management solutions. I apologize for any issues you may have run into while using WEBENCH® for your LM26001 design.
I am able to create a design using the conditions you have provided, and I do receive the same comment regarding the phase margin being low. I need to investigate this issue some more, since there seems to be a mismatch between the WEBENCH calculated Phase Margin and the Simulation Phase Margin.
I will get back to you as soon as I am able to identify a solution.
If you have any other questions or concerns, please let me know.
Regards
Jonathan Arzadon
Applications Engineer
WEBENCH Design Center
Texas Instruments