SLVS543R August   2004  – October 2023 TL431 , TL432

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Thermal Information
    4. 7.4  Recommended Operating Conditions
    5. 7.5  Electrical Characteristics, TL431C, TL432C
    6. 7.6  Electrical Characteristics, TL431I, TL432I
    7. 7.7  Electrical Characteristics, TL431Q, TL432Q
    8. 7.8  Electrical Characteristics, TL431AC, TL432AC
    9. 7.9  Electrical Characteristics, TL431AI, TL432AI
    10. 7.10 Electrical Characteristics, TL431AQ, TL432AQ
    11. 7.11 Electrical Characteristics, TL431BC, TL432BC
    12. 7.12 Electrical Characteristics, TL431BI, TL432BI
    13. 7.13 Electrical Characteristics, TL431BQ, TL432BQ
    14. 7.14 Typical Characteristics
  9. 8 Parameter Measurement Information
    1. 8.1 Temperature Coefficient
    2. 8.2 Dynamic Impedance
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
    4. 9.4 Device Functional Modes
      1. 9.4.1 Open Loop (Comparator)
      2. 9.4.2 Closed Loop
  11. 10Applications and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Comparator With Integrated Reference
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Basic Operation
            1. 10.2.1.2.1.1 Overdrive
          2. 10.2.1.2.2 Output Voltage and Logic Input Level
            1. 10.2.1.2.2.1 Input Resistance
        3. 10.2.1.3 Application Curve
      2. 10.2.2 Shunt Regulator/Reference
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
          1. 10.2.2.2.1 Programming Output/Cathode Voltage
          2. 10.2.2.2.2 Total Accuracy
          3. 10.2.2.2.3 Stability
          4. 10.2.2.2.4 Start-Up Time
        3. 10.2.2.3 Application Curve
    3. 10.3 System Examples
    4. 10.4 Power Supply Recommendations
    5. 10.5 Layout
      1. 10.5.1 Layout Guidelines
      2. 10.5.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Device Nomenclature
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10.3 System Examples

GUID-7E201504-7A7D-4DE0-908C-D9B46FEEBC0F-low.gif
A. R should provide cathode current ≥1 mA to the TL431 at minimum V(BATT).
Figure 10-5 Precision High-Current Series Regulator
GUID-5FA4F4FA-1D98-4E94-9025-E5E4FCBFA6AF-low.gifFigure 10-6 Output Control of a Three-Terminal Fixed Regulator
GUID-C7A358A3-4C49-4937-A7D6-CF0A0163B32D-low.gifFigure 10-7 High-Current Shunt Regulator
GUID-303BD4E9-A09A-4124-9A10-5357A86AC743-low.gif
A. Refer to the stability boundary conditions in Figure 7-16 and Figure 7-18 to determine allowable values for C.
Figure 10-8 Crowbar Circuit
GUID-8668FC8E-4F6E-4985-96A7-D66F4D6D586D-low.gifFigure 10-9 Precision 5-V, 1.5-A Regulator
GUID-9F0D2776-44A3-415E-854E-9F9B2A3EE08C-low.gif
A. Rb should provide cathode current ≥1 mA to the TL431.
Figure 10-10 Efficient 5-V Precision Regulator
GUID-57A67244-9BE1-46F6-B4FD-440B387575B9-low.gifFigure 10-11 PWM Converter With Reference
GUID-3FBAF38F-A638-45B4-8F8A-5817C316C8C9-low.gif
A. Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL431 at the available VI(BATT).
Figure 10-12 Voltage Monitor
GUID-132BFE0C-53B2-4B05-AA4B-E94182760516-low.gifFigure 10-13 Delay Timer
GUID-91AD93CE-67F2-41EF-B37E-AB260DA7DF17-low.gifFigure 10-14 Precision Current Limiter
GUID-7C7ECCCB-D157-421E-A6FA-2E72CEFE6779-low.gifFigure 10-15 Precision Constant-Current Sink