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TL431LI Fiches technique(PDF) 12 Page - Texas Instruments

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No de pièce TL431LI
Description  Programmable Shunt Regulator with Optimized Reference Current
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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TL431LI Fiches technique(HTML) 12 Page - Texas Instruments

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TL431LI
TL432LI
SLVSDQ6 – JULY 2018
www.ti.com
Product Folder Links: TL431LI TL432LI
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
9.3 Feature Description
TL43xLI consists of an internal reference and amplifier that outputs a sink current based on the difference
between the reference pin and the virtual internal pin. The sink current is produced by the internal Darlington
pair, shown in the above schematic (Figure 19). A Darlington pair is used in order for this device to be able to
sink a maximum current of 15 mA.
When operated with enough voltage headroom (
≥ 2.495 V) and cathode current (IKA), TL43xLI forces the
reference pin to 2.495 V. However, the reference pin can not be left floating, as it needs IREF ≥ 0.8 µA (please
see Specifications). This is because the reference pin is driven into an npn, which needs base current in order
operate properly.
When feedback is applied from the Cathode and Reference pins, TL43xLI behaves as a Zener diode, regulating
to a constant voltage dependent on current being supplied into the cathode. This is due to the internal amplifier
and reference entering the proper operating regions. The same amount of current needed in the above feedback
situation must be applied to this device in open loop, servo or error amplifying implementations in order for it to
be in the proper linear region giving TL43xLI enough gain.
Unlike many linear regulators, TL43xLI is internally compensated to be stable without an output capacitor
between the cathode and anode. However, if it is desired to use an output capacitor Figure 19 can be used as a
guide to assist in choosing the correct capacitor to maintain stability.
9.4 Device Functional Modes
9.4.1 Open Loop (Comparator)
When the cathode/output voltage or current of TL43xLI 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, TL43xLI will
have the characteristics shown in Figure 18. With such high gain in this configuration, TL43xLI is typically used
as a comparator. With the reference integrated makes TL43xLI the preferred choice when users are trying to
monitor a certain level of a single signal. SLVA987 more details on open loop comparator applications on the
TL431LI.
9.4.2 Closed Loop
When the cathode/output voltage or current of TL43xLI is being fed back to the reference/input pin in any form,
this device is operating in closed loop. The majority of applications involving TL43xLI 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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