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LMR14050: WEBENCH Invalid Design Error

Part Number: LMR14050


1. Could LMR14050 output stable 0.1 - 5A for all Vout range (0.75 - 38V)? 

2. In webench design, some Vin, Vout and Iout combinations are invalid. Where can I get the error message so that I could figure out the root cause and fix the issue? For example, the following 2 combinations are invalid. What are the reasons?

Vin=4-40V, Vout=38V, Iout=5A is invalid.

Vin=4-40V, Vout=0.75V, Iout=5A is invalid.

3. For the desired Vout and Iout, is there any tool could tell me the required Vin range directly? 

4. I cannot request software "PSpice for TI" from TI website. Could you help me to solve this issue? 


  • Hi Steven,

    You are right about some design parameter combinations being invalid. I will raise this issue with the Webench team.

    In addition, what problems are you encountering with the PSPICE download? Usually you will need to login and request the software.



  • Hi Steven,

    The Webench team responded and said that the low VIN parameters caused the design to fail.

    Therefore, I tried with a nominal VIN of 40V, and I was able to get a couple simulations for your design, but only at IOUT = 4A. Above that, the junction temperature became too high. 

    Here is the simulation link: