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TPS62824A: Injected Signal Amplitude for Bode Plot Analysis

Shinichi Yokota
Genius 9715 points
Part Number: TPS62824A
Other Parts Discussed in Thread: TPS62130

Hello,

I'm wondering how large an injected signal amplitude should be for Bode plot analysis of a TPS62824A supply circuit. The apps note "How to Measure the Control Loop of DCS-Control™ Devices" (SLVA465A) says on page 3, "For Figure 3, the maximum signal voltage at either C1 or C2 was 2 mVRMS." I understand that this is an example of the TPS62130, but do you recommend 2 mVRMS for the TPS62824A circuit, too?

Best regards,
Shinichi Yokota

  • +1
    TI__Mastermind 21580 points

    Hi Shinichi,

    It's good to keep the AC signal amplitude low, so that there are no large signal effects. I would recommend to keep it below 2mVRMS to start with. In case you see the measurement is too noisy then you can increase the injected signal some more.

    Best regards,

    Varun