THS4551: How can I convert TINA model into LTSpice?
Part Number: THS4551
I was able to get the THS4551 in LTSpice, but its extremely slow. Does it run slow in TINA as well?
Would you be able to share your schematic or recreate it in Tina-TI. In a simple circuit schematic, it should not run slowly. Are you getting an output in LTspice?
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On second review, its not behaving properly. I followed the instructions you gave me in an earlier forum post. Here is the schematic, can you try and get the model to work on your end and then attach here?THS4551_simple.zip
In reply to Erik Anderson41:
Yes sure, I can look into this and get back to you by tomorrow.
In reply to SimaJalaleddine:
I think I figured it out, looks like I had my feedback connected improperly, so it was positive feedback instead of negative feedback.
However, I'm also getting used to TINA now, can you point me to documentation that shows how to measure phase margin in TINA? In LTSpice I break the feedback loop and insert an AC source, but I'm getting very low open-loop gain. It seems a bit tricky with this THS4551 diff amp.
I'm trying to make a LPF for the THS4551 at 20kHz, but from what I read there is gain peaking due to the feedback cap resonance, so that's why I'm trying to look at it in SPICE.
One way to do the LG phase margin is shown in this article - some preparatory material is in #5 as well,
If you need a particular MFB filter, let me know - have done quite a lot in that area using the THS4551,
In reply to Michael Steffes:
To add onto Michael's response, this video series goes over a few examples on analyzing stability for fully differential amplifiers (FDA): FDA Precision lab Stability. To change component properties in Tina-Ti, right click on the component and select properties.
Ok, thank you Sima and Michael, I will work through this next week.
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