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ATL431LI_V02 Datasheet(Hoja de datos) 17 Page - Texas Instruments

No. de Pieza. ATL431LI_V02
Descripción  ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator
Descarga  29 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 17 page
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REF
CATHODE
ANODE
Copyright © 2017, Texas Instruments Incorporated
R2
VSUP
RSUP
R1
VO
(
R1
Vref
0.1%
R2
0.1%
ATL43xLIx
= 1 +
Vref
)
CL
17
ATL431LI
ATL432LI
www.ti.com
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
Product Folder Links: ATL431LI ATL432LI
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
11.2.3 Shunt Regulator/Reference
Figure 26. Shunt Regulator Schematic
11.2.3.1 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
2.5 V - 36 V
Load Capacitance
2 µF
Feedback Resistor Values and Accuracy (R1 and R2)
10 kΩ
11.2.3.2 Detailed Design Procedure
When using ATL431LI as a Shunt Regulator, determine the following:
Input Voltage Range
Temperature Range
Total Accuracy
Cathode Current
Reference Initial Accuracy
Output Capacitance
11.2.3.2.1
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 26, 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 26. The cathode voltage can be more accuratel determined by
taking in to account the cathode current:
Vo = (1+R1/R2) × VREF-IREF × R1
(1)
In order for this equation to be valid, ATL431LI 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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