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TINA/Spice/TINA-TI: Loop stability of an LDO control loop

Mike Wirth40
Prodigy 50 points
Part Number: TINA-TI

Tool/software: TINA-TI or Spice Models

Again, trying to do a loop stability analysis of the TPS7A4501 LDO in TINA-TI. Keep getting sent to the video on loop stability, this is a general tutorial. Looking for an actual simulation setup in TINA-TI.

Cannot get a sept frequency source into the schematic. Tried the Function Generator but that will not be inserted into the circuit.

- Any simulations circuits in TINA-TI to measure the loop stability of the control loop in the LDO?

- How do you insert, or change an AC source so that it sweeps frequency?

Thanks in advance.

  • 0
    TI__Genius 9775 points
    Hi Mike,

    When I check the model for this part: www.ti.com/.../toolssoftware , it shows that it is "transient model" which means it cannot be used for ac small signal analysis.

    On TINA-TI, to insert AC Source, you simply go to Sources Tab -> Click on Voltage Generator -> Click on the schematic. If you cannot insert most likely you have the file in read-only mode. So try to open fresh TINA-TI from windows start menu, then do those steps. Also don't forget to put measurement meter as one the output by going to meters tab -> Voltage Pin (or Volt Meter). Once you have done all of these, you can simply go to Analysis -> AC Analysis -> AC Transfer Characterisic.

    If certain TI LDO part has so called "average" model in the title, then you will be able to do ac small signal analysis. In this case, one possible way to do loop analysis is by cutting the loop between the input to the LDO amplifier and the rest of circuit and then inject AC Voltage Generator to the amplifier and take the measurement output at the new node used to be attached to the LDO amplifier prior to the cutting.

    Herman