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TL431LI Datasheet(Fiches technique) 16 Page - Texas Instruments

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Numéro de pièce TL431LI
Description  Programmable Shunt Regulator with Optimized Reference Current
Télécharger  32 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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 16 page
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TL43xLIx
RS
0.1%
IO
VI(BATT)
I
O
V
ref
R
S
=
Copyright © 2017, Texas Instruments Incorporated
Time (s)
-0.001
-0.0006
-0.0002
0.0002
0.0006
0.001
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
D001
Vin
Vka(Rsup=10k:)
Vka(Rsup=1k:)
16
TL431LI
TL432LI
SLVSDQ6 – JULY 2018
www.ti.com
Product Folder Links: TL431LI TL432LI
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Copyright © 2018, Texas Instruments Incorporated
10.2.1.2.2
Output Voltage and Logic Input Level
In order for TL43xLI to properly be used as a comparator, the logic output must be readable by the receiving
logic device. This is accomplished by knowing the input high and low level threshold voltage levels, typically
denoted by VIH and VIL.
As seen in Figure 21, TL43xLI's output low level voltage in open-loop/comparator mode is approximately 2 V,
which is typically sufficient for 5 V supplied logic. However, would not work for 3.3 V and 1.8 V supplied logic. To
accommodate this a resistive divider can be tied to the output to attenuate the output voltage to a voltage legible
to the receiving low voltage logic device.
TL43xLI's output high voltage is equal to VSUP due to TL43xLI being open-collector. If VSUP is much higher than
the receiving logic's maximum input voltage tolerance, the output must be attenuated to accomadate the
outgoing logic's reliability.
When using a resistive divider on the output, be sure to make the sum of the resistive divider (R1 and R2 in
Figure 20) is much greater than RSUP in order to not interfere with TL43xLI's ability to pull close to VSUP when
turning off.
10.2.1.2.2.1
Input Resistance
TL43xLI requires an input resistance in this application in order to source the reference current (IREF) needed
from this device to be in the proper operating regions while turning on. The actual voltage seen at the ref pin will
be VREF=VIN-IREFRIN. Because IREF can be as high as 0.8 µA it is recommended to use a resistance small enough
that will mitigate the error that IREF creates from VIN.
10.2.1.3 Application Curve
Figure 21. Output Response With Various Cathode Currents
10.2.2 Precision Constant Current Sink
Figure 22. Precision Constant Current Sink Application Schematic




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