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LM431: Stability Boundary Condition for High Iz condition

Guru 17625 points

Replies: 1

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Part Number: LM431

About stability boundary condition of LM431, datasheet P7 is described only Iz:10mA condition.

Is there the other stability data for high Iz condition? (For example, Iz:22.5mA) 

Is LM431 applicable below design calculator?

If yes and Idiv/Iref become less than 100(Warning), what is any influence?

Best regards,

Satoshi

  • Hi Satoshi,

    Unfortunately we do not have stability data for higher Iz in that test condition. What I can say is that typically stability has a larger range with higher Iz. Is it possible for you to use the stability graph using the cathode current measurements?

    The calculator is comparable using TL431 except for the thermals since the thermal characteristics are different. Voltage deviation over temperature is also different.

    Hope this helps,
    Ethan

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