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TPS54A20: How to get phase margin and gain from Webench/TINA-TI?

AnBer
Mastermind 29370 points
Part Number: TPS54A20
Other Parts Discussed in Thread: TINA-TI

Team,

Customer has a stability problem with TPS54A20 and want to ana;yze the design to get the theorethical phase margin and gain.

-The older webench (flash based) enables to simulates this. However it does not seem possible with the new Webench (HTML5).
Is there a way to simulate it on the new webench?

-Using TINA-TI (latest version Version 9.3.200.277 SF-TI) from a webench (HTML 5) export (for startup simulation) does not seen to work.
See error below.
Could you please help to solve the problem in order to simulate the phase margin and gain of the circuit?

Thanks in advance,

A.

  • 0
    TI__Mastermind 35135 points

    Hi AnBer,

    As a constant on-time device, I don't believe we ever had support for phase and gain margin simulations with this device in WEBENCH. I also don't have any other way to get the theoretical phase and gain margins.

    I checked the export from WEBENCH to TINA-TI and, while I didn't get the same error, there does seem to be an issue with it running properly. I will ask someone to help look into this. Running the simulation from within WEBENCH however seems to be working. When this error popped up, were you or the customer trying to do an average simulation with the exported file? This exported file will only support transient simulations as it uses a transient model.

    The best method I can recommend to simulate the stability with this device would be to run load step transient simulations (when we get it fixed) and look at the response on the output. It is possible to get a reasonable judgement on the stability from this. Page 3 in the app note I linked below is a good reference for judging the stability from transient response. Unfortunately transient response simulations with this device will be time consuming due to the relatively high fsw.

    If you can provide some more details on the customer's design I can give some recommendations to help them with the stability problem.

    Anthony

  • 0 in reply to Anthony F
    TI__Mastermind 35135 points

    Discussion has moved to e-mail so I am marking this as resolved for now.