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TL431 - simulation of the stability

Other Parts Discussed in Thread: TL431, ATL431

Hi all

Would  you mind if we ask TL431?

We heard that as follows on E2E forum;
"Unfortunately, the TL431 model does not simulate the stability very well, as I have seen it stable in regions where it is definitely unstable.
A better, more closely accurate model would be to use the ATL431 model as far as stability is concerned, but is not a perfect replacement for the TL431."

Do you have TL431 TINATI's model for the stability test(AC test)?
Of course, we tested using model which is "TL431x, TL432x TINA-TI AC Reference Design".
http://www.ti.com/product/TL431/toolssoftware

We could not find it on the WEB.

We really need your help.

Kind reagards,

Hirotaka Matsumoto

  • Hello Matsumoto-san,

    You are correct, as mentioned previously, the TL431 transient model does not simulate the stability very well. 

    The model that you provide for the TINA AC Reference model, does show the stability in terms of the phase margin as the capacitance is changed at the cathode. 

    So this AC TL431 model does provide insight into the stability of the device, but the transient model does not show that it will be unstable under the same conditions.

    Best,
    Michael