TLV431ACDBVT datasheet(19/54 Pages) TI

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7.4 Device Functional Modes

7.4.1 Open Loop (Comparator)

When the cathode/output voltage or current of TLV431 is not being fed back to the reference/input pin in any

form, this device is operating in open loop. With proper cathode current (Ika) applied to this device, TLV431 will

have the characteristics shown in Figure 5-6. With such high gain in this configuration, TLV431 is typically used

as a comparator. With the reference integrated makes TLV431 the preferred choice when users are trying to

monitor a certain level of a single signal.

7.4.2 Closed Loop

When the cathode/output voltage or current of TLV431 is being fed back to the reference/input pin in any form,

this device is operating in closed loop. The majority of applications involving TLV431 use it in this manner to

regulate a fixed voltage or current. The feedback enables this device to behave as an error amplifier, computing

a portion of the output voltage and adjusting it to maintain the desired regulation. This is done by relating the

output voltage back to the reference pin in a manner to make it equal to the internal reference voltage, which can

be accomplished through resistive or direct feedback.

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TLV431, TLV431A, TLV431B

SLVS139Z – JULY 1996 – REVISED JUNE 2024

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TLV431ACDBVT Datasheet(PDF) 19 Page - Texas Instruments