TINA-TI_ENGLISH: Complete List of parts?

Hello Keith,

  Thank you for using Tina-TI. I do not recommend using the Tina-TI library to find our models. We do have models pre-populated in the libraries when you download the simulator, but if you want to get the most up-to-date models, then I would instead download the Tina-TI files or PSpice models from the device product folder.

  For example, for BUF634A, this would be located at this area of the product folder: https://www.ti.com/product/BUF634A#design-tools-simulation. And, same for OPA2810: https://www.ti.com/product/OPA2810#design-tools-simulation. This will be the same for all our other devices.

   To give more details on the composite loop, it is hard to tune these values by hand, therefore simulating it will be the best way to determine stability. I have worked on this composite loop with OPA2810, OPA656, and OPA817 with the BUF634A. I found around 1uF is needed in the composite loop will stabilize the circuit. I have built up stability sims in Tina-TI before to test this with lab measurements:

   I have attached a zipped folder of a couple of examples. For transient, it will run in the standard configuration. While for the stability sims, it is best to split it up to determine stability by phase margin of each stage. Around 40-45 degrees of phase margin is recommended for system stability. Note: Make sure phase starts at 180 degrees, if not then calculate phase margin at loop gain crossover of 0dB from the shift. For example, if phase starts at -180, then -90 degrees come from AOL first pole then another -90 will come from other poles in the system or 2nd pole of the amplifier which will equal to -360 for a full phase inversion which is complete instability. Therefore, phase margin for stability should be around or more than -180-90-45 = -315 degrees at loop gain 0dB crossover.

Thank you,

Sima

 Composite Loop Examples.zip