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THS4521: THS4521- Issue in Pspice Model

Balakrishnan Kumar
Prodigy 250 points
Part Number: THS4521
Other Parts Discussed in Thread: THS4551

Dear Support Team, 

Am simulating some of analog circuits in LT spice , So i have used LT1994 part and observed result are matching with my calculated values.

When i replace LT1994 part into TI part THS5421 i could see difference in output voltage/Gain with THS4521. I believe some issue in THS4521 model. Could you please help us and sort it out

Please see the below image for better understanding.

Simulation With LT1994

Simulation With THS5421: 

Thanks

  • 0
    Guru 140200 points

    Hi Balakrishnan,

    in the THS4521 TINA-TI Reference Design (Rev. D) it's working properly:

    Kai

  • 0 in reply to kai klaas69
    Prodigy 250 points

    Hi Kai, 

    Yes i agree THS4521 works fine in TINIA TI software, But there is model mismatch between TI site and model available in TINA TI folder. 

     I downloaded the Pspice model from TI site and viewed in net list viewer are  shown below., And then converted file to LTspice model for simulation

     

    Second: In TINA ti  tool i selected the THS4521 part and viewed the model in net list viewer and find some difference in spice model. Please see the below image: 

    Could you please share me correct working spice model of THS4521, Since i need to use the model in LTspice. 

    Attaching the Pspice model which i downloaded from TI site 

    sbom343c.zip

    Regards

    Bala

  • 0 in reply to Balakrishnan Kumar
    Guru 48395 points

    The THS4521 had many performance and model issues -the THS4551 device and model fixed all of that. Most folks here are not likely going to help much on LTSpice problems, but you can try this .lib version of the original THS4551 model (2016). The newest one (2019) is not correct on noise and went to a newer template that seems to not work in LTSpice, 

    2727.THS4551.lib

  • 0 in reply to Balakrishnan Kumar
    TI__Genius 15565 points

    Hello Bala,

    I recommend using the models found on the TI site rather than those found within TINA itself. This will ensure you are using the most up to date version. We cannot support issues specifically to LTspice, however the model should have no problem working on TINA or Pspice. If you need to use LTspice maybe try the older version found on TINA? or as Michael suggested use a part with similar functionality such as the THS4551.

    Best,

    Hasan Babiker 

  • 0 in reply to Hasan Babiker31
    Guru 48395 points

    True, and normally what I do as well - however, I have been noticing the latest GWL models seem to always fail in LTSpice - the latest for the THS4521 is 2016 so pre-GWL. 

    His question was getting through a LTSpice run problem - might get past that using that older THS4551 .lib model I sent. (also, the last I checked last week, the updated THS4551 GWL model is still too low on input noise). 

  • 0 in reply to Michael Steffes
    Prodigy 250 points

    Hi Michael, 

    THS4551 models works fine thank you for support.

    Regards

    Bala