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Loop test method for INA333 in TINA

Max Han
Intellectual 2260 points

Other Parts Discussed in Thread: INA333

in TI precision lab training, a method is introduced to test loop stability.

as below figure.

I want to know how to test INA333's loop stability? it seems that feedback leg can't be break by 1H inductor.

  • 0 in reply to Max Han
    TI__Guru 64495 points
    Hello,

    You're correct. The INA333 is a closed-loop device so you don't have access to the feedback nodes required to perform the stability analysis. Therefore for closed loop devices such as the INA333 you'll need to perform the indirect stability tests described in the TIPL videos. Methods include injecting a small signal step response on the input while observing the INA output to look for overshoot/ringing, or performing an AC transfer function analysis to look for closed-loop gain peaking. Both %overshoot and gain peaking can be translated back to the system phase margin using the curves provided in the TIPL training videos.