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TINA/Spice/TPS62160-Q1: Bode plot gain value clarification

Jared Becker
Genius 11845 points
Part Number: TPS62160-Q1
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi Team,

I used Webench analyze the TPS62160-Q1, however, there is not a option to produce a bode plot to check stability for this device in Webench. I went ahead and downloaded the schematic to TINA to tried running an AC analysis on the circuit. 

For some reason, my gain plot is starting at <130dB.. Is this accurate? I am trying to check stability, so I am looking for the 0dB crossing point, but I am not sure how to correlate what I'm seeing on the bode plot to the 0dB crossing point.

Please see attached file with output.

TPS6216x-Q1.tsc

Thank you,

Jared

  • 0
    TI__Mastermind 39210 points

    HI Jared,

    Please refer to the following FAQ about running loop response on switching regulators:

     

    In general, DCS and DCAP topology devices do not have average models. These have limited selection of filter inductor and capacitor and no option to adjust compensation. Hence using the L and C values specified in the datasheet (there is usually a table with acceptable values) guarantees stable operation.