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TL431LI Datasheet(Fiches technique) 18 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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 18 page
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REF
CATHODE
ANODE
R2
V
SUP
RSUP
R1
VO
(
R1
Vref
0.1%
R2
0.1%
TL43xLIx
= 1 +
Vref
)
CL
Copyright © 2017, Texas Instruments Incorporated
18
TL431LI
TL432LI
SLVSDQ6 – JULY 2018
www.ti.com
Product Folder Links: TL431LI TL432LI
Submit Documentation Feedback
Copyright © 2018, Texas Instruments Incorporated
10.2.3 Shunt Regulator/Reference
Figure 23. Shunt Regulator Schematic
10.2.3.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 3. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Reference Initial Accuracy
1.0 %
Supply Voltage
24 V
Cathode Current (Ik)
5 mA
Output Voltage Level
2.495 V - 36 V
Load Capacitance
2 µF
Feedback Resistor Values and Accuracy (R1 and R2)
10 kΩ
10.2.3.2 Detailed Design Procedure
When using TL43xLI as a Shunt Regulator, determine the following:
Input Voltage Range
Temperature Range
Total Accuracy
Cathode Current
Reference Initial Accuracy
Output Capacitance
10.2.3.2.1
Programming Output/Cathode Voltage
In order to program the cathode voltage to a regulated voltage a resistive bridge must be shunted between the
cathode and anode pins with the mid point tied to the reference pin. This can be seen in Figure 23, with R1 and
R2 being the resistive bridge. The cathode/output voltage in the shunt regulator configuration can be
approximated by the equation shown in Figure 23. The cathode voltage can be more accurate determined by
taking in to account the cathode current:
Vo=(1+R1/R2)VREF-IREFR1
(1)
In order for this equation to be valid, TL43xLI must be fully biased so that it has enough open loop gain to
mitigate any gain error. This can be done by meeting the Imin spec denoted in Specifications.




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