LM431

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SNVS020H – MAY 2000 – REVISED JANUARY 2016

Feature Description (continued)

Figure 11. Equivalent Circuit

8.4 Device Functional Modes

The LM431 is most commonly operated in closed-loop mode, where the reference node is tied to the output

voltage via a resistor divider. The output voltage remains in regulation as long as Iz is between 1 mA and 100

mA. The part can also be used in open-loop mode to act as a comparator, driving the feedback node from

another voltage source.

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