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  • TI Thinks Resolved

TINA/Spice: Small Voltage on Output Cap of Buck Converter

Tool/software: TINA-TI or Spice Models

Hello,

I am having issues trying to simulate a start up of 12 -> 3.3 V buck. The output voltage measured is usually very small when I run DC nodal analysis, around 10-12 mV or lower. Is this a common issue, or did I connect something incorrectly in my circuit?tida-020005.TSC

Luis

  • HI Luis,

    Please perform a time domain analysis instead of a DC analysis. Run the time domain simulation until the output completes softstart and settles down and observe the voltage at vout then.

    DC simulation is spice is considered simulation at timie t=0. Since the output is 0V at this time, you are seeing a very small value.

    Nikhil Gupta | Product Folder Modeling                                                                                                                                                    

    All TI Spice Models can be found here | All WEBENCH supported devices can be found here

    New to TINA-TI? Its a free spice simulator! Try out this short Video Training Series

     

  • In reply to Nikhil Gupta (Online Design Tools):

    Hi Nikhil,

    My apologies, but it is not currently clear to me how to perform a time domain analysis instead of DC analysis. Could you please give me more detail on how to accomplish this?

    Luis

  • In reply to Luis Cordova:

    Hi Luis,

    It might be helpful for you to go through this short video training series (see below). It will help you get up to speed on this.

    Nikhil Gupta | Product Folder Modeling                                                                                                                                                    

    All TI Spice Models can be found here | All WEBENCH supported devices can be found here

    New to TINA-TI? Its a free spice simulator! Try out this short Video Training Series

     

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