• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 615 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS54160: Output impedance does not match expected results

Jacob Hegland
Prodigy 40 points
Part Number: TPS54160

I am simulating output impedance of the TPS54160 power supply, and I am seeing results which do not match what I would expect.

I would expect the output impedance to start high, dip in the center, and rise again at higher frequencies.

The simulation I am using is also included. What am I doing wrong?

TPS54160_Simulation.TSC

Thanks,

Jacob

  • 0
    TI__Expert 8130 points

    Hello Jacob,

    Let me get further input from the internal team. I will get back to you as soon as possible.

    Thanks,
    Alejandro

  • 0 in reply to iAlejandro
    TI__Expert 8130 points

    Jacob,

    The output impedance of the simulation seems to be okay.

    The output impedance will start off low because the loop gain is high at low frequencies. As the frequency increases the loop gain will drop and output impedance will increase. Eventually, there will be some peaking due to the loop dynamics.
    And at frequencies above the loop bandwidth, the loop gain is less than one, so it can't help but reduce the output impedance.

    Regards,
    Alejandro