Motor de Búsqueda de Datasheet de Componentes Electrónicos
Selected language     Spanish  ▼
Nombre de pieza
         Descripción


ATL431LI_V02 Datasheet(Hoja de datos) 16 Page - Texas Instruments

No. de Pieza. ATL431LI_V02
Descripción  ATL431LI / ATL432LI High Bandwidth Low-Iq Programmable Shunt Regulator
Descarga  29 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo 

 16 page
background image
ATL43xLIx
RS
0.1%
IO
VI(BATT)
I
O
V
ref
R
S
=
Copyright © 2017, Texas Instruments Incorporated
16
ATL431LI
ATL432LI
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
www.ti.com
Product Folder Links: ATL431LI ATL432LI
Submit Documentation Feedback
Copyright © 2017–2019, Texas Instruments Incorporated
11.2.2 Precision Constant Current Sink
Figure 25. Precision Constant Current Sink Application Schematic
11.2.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Supply Voltage (VI(BATT))
5 V
Sink Current (IO)
100mA
Cathode Current (Ik)
5 mA
11.2.2.2 Detailed Design Procedure
When using ATL43xLI as a constant current sink, determine the following:
Output Current Range
Output Current Accuracy
Power Consumption for ATL43xLI
11.2.2.2.1
Basic Operation
In the configuration shown, ATL43xLI acts as a control component within a feedback loop of the constant current
sink. Working with an external passing component such as an BJT, ATL43xLI provides precision current sink
with accuracy set by itself and the sense resistor RS. This circuit can also be used as LED driving circuit.
11.2.2.2.1.1
Output Current Range and Accuracy
The output current range of the circuit is determined by the equation shown in the configuration. Keep in mind
that the VREF equals to 2.5V. When choosing the sense resistor RS, it needs to generate 2.5V for the ATL43xLI
when IO reaches the target current. If the overhead voltage of 2.5V is not acceptable, please consider lower
voltage reference devices such as TLV43x or TLVH43x.
The output current accuracy is determined by both the accuracy of ATL43xLI chosen, as well as the accuracy of
the sense resistor RS. The internal virtual reference voltage of ATL43xLI will be within the range of 2.5 V ±(0.5%
or 1.0%) depending on which version is being used. Another consideration for the output current accuracy is the
temperature coefficient of the ATL43xLI and RS. Please refer to the electrical characterization table for the
specification of these parameters.
11.2.2.2.2
Power Consumption
In order for ATL43xLI to properly be used as a control component in this circuit, the minimum operating current
needs to be reached. This is accomplished by setting the external biasing resistor in series with the ATL43xLI.
For ATL43xLI, the minimum operating current is 80µA and with margin consideration, most of the designs set
this current to be higher than 100µA. To achieve lower power consumption, please consider devices such as
ATL43x.




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29 


Datasheet Download




Enlace URL

¿ALLDATASHEET es útil para Ud.?  [ DONATE ]  

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Favorito   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl