Tool/software: WEBENCH® Design Tools
I have the following power requirements.
Vin (minimum) = 9V
Vin (maximum) = 30V
Vout = 5V
Iout (maximum) = 2A
Operating temperature (maximum) = 30C.
I selected the LMZ23603 based on what I had in stock at work.
The data sheet of the LMZ23603 showed in Figure-3 the efficiency of the device at 5V output at various output current levels with input voltage ranging from 9V to 36V.
The selection seemed fine but I wanted to simulate with WebBench just to confirm the design. For my operating conditions listed above the WebBench reported that the design is not stable as it had a phase margin that is smaller than 35 or greater than 120.
- First, is there something wrong in my interpretation of the data sheet and the WenBench report.
- If not can I assume from the above that the data sheet efficiency curves were obtained for designs that might be unstable and therefore I cannot rely on such data?
- Or am I using the WebBench incorrectly.
Thanks for the replies in advance.