Forum Post: Webench Phase Margin error TPS61175

Hi,

Please could you help me with the following problem.

I'm using webench for single supply smps design but when I select a different inductor part I get an error message saying that the phase margin is -54 degrees (or similar). If I then change back to the original part then I get another error message saying that the phase margin is also about -54 degrees. When I first run the design the phase margin is fine (+35 degrees)  

My input parameters for the initial design are:  vin_min = 10V; vin_max = 18V; Vout = 25V and Iout =0.1A temp=50degrees.

I'd be grateful if you could shed some light on this so that  I could select a different inductor with the same value

Regards

Keith