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LM4050QML-SP: Precision Shunt Voltage Regulator (LM4050)

BOb Wagner
Prodigy 90 points
Part Number: LM4050QML-SP
Other Parts Discussed in Thread: LM4050-N,

HI Folks,

I am interested in using the LM4050 5V reference, and am searching for a spice model for the 5V version. I came across a TI area, but I am not clear which download is the 5V output  regulator. The area I went to is

www.ti.com/.../LM4050-N ZIP&tisearch=Search-EN-everything

When you go there are so many choices, I am not clear on which is the 5V version as the output is not listed. Could someone please direct me to the correct one for PSPICE.

 

Thanks in advance, Bob Wagner

  • 0
    TI__Expert 7185 points

    Hi Bob,

    Are you looking for a PSpice model for the 5V version of the space-grade LM4050QML-SP or the commercial-grade LM4050-N? There are currently no models available for the space-grade part, however, if you are looking for the commercial-grade version then you can see the available models under the "Design and Development" section of the part's webpage (link here). The models for the 5V versions of the part will have "5p0" in the name.

    Thanks,

    Sarah

  • 0 in reply to Sarah Koch
    Prodigy 90 points

    Thanks for the information Sarah.

    One thing I notice is if I load the .olb and .lib file into PSpice, rather than run the TI simulation, I don't see the transient behavior that I see when I run the design supplied in the down load. Is this because some of the transient behavior is not incorporated into the "LIB file" but is incorporated into the TI simulation. I am asking this because I see the note on the TI simulation that says " The PSpice macromodel for LM4050_NB5P0 is encrypted...".  Any thoughts?

    Thanks in advance, Bob Wagner

  • 0 in reply to BOb Wagner
    TI__Expert 7185 points

    Hi Bob,

    Can you tell me which signal(s) look different when you run the two different simulations and possibly post screenshots? I believe I may also see the difference you are referring to, but want to make sure we are on the same page. 

    If you open the simulation profile for the default TI simulation and de-select the "Skip initial transient bias point calculation" box underneath the maximum step size field, the TI simulation should then match the simulation you set up from scratch using the lib and olb files. Likewise, if you select this box in the simulation profile you set up it should then match the default TI simulation. Can you let me know if this fixes the discrepancy you're seeing?

    Thanks,

    Sarah