SLVSB44C July   2012  – November 2020 TL1431-SP

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
    4. 8.4 Device Functional Modes
      1. 8.4.1 Open Loop (Comparator)
      2. 8.4.2 Closed Loop
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Programming Output/Cathode Voltage
      4. 9.2.4 Total Accuracy
      5. 9.2.5 Stability
      6. 9.2.6 Start-up Time
      7. 9.2.7 Application Curve
      8. 9.2.8 System Examples
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.8 System Examples

Table 9-2 lists example circuits of the TL1431.

Table 9-2 Table of Example Circuits
APPLICATIONFIGURE
Shunt regulatorFigure 9-3
Single-supply comparator with temperature-compensated thresholdFigure 9-4
Precision high-current series regulatorFigure 9-5
Output control of a three-terminal fixed regulatorFigure 9-6
Higher-current shunt regulatorFigure 9-7
CrowbarFigure 9-8
Precision 5-V, 1.5-A, 0.5% regulatorFigure 9-9
5-V precision regulatorFigure 9-10
PWM converter with 0.5% referenceFigure 9-11
Voltage monitorFigure 9-12
Delay timerFigure 9-13
Precision current limiterFigure 9-14
Precision constant-current sinkFigure 9-15
GUID-65E729A5-629A-4773-BA74-DA8684931002-low.gif
R must provide cathode current ≥1 mA to the TL1431 at minimum V(BATT).
Figure 9-3 Shunt Regulator
GUID-AF6CA806-A320-4977-A71B-536B64E31001-low.gif
R must provide cathode current ≥1 mA to the TL1431 at minimum V(BATT).
Figure 9-5 Precision High-Current Series Regulator
GUID-7B01A1C5-D86D-4E6F-B338-231E1D4BB6BE-low.gifFigure 9-7 Higher-Current Shunt Regulator
GUID-07294D5A-A12D-4382-8659-2E8DAE9A434E-low.gifFigure 9-9 Precision 5-V, 1.5-A, 0.5% Regulator
GUID-7C24602B-5A3C-4BA2-ADC0-4B82491C0AF8-low.gifFigure 9-11 PWM Converter With 0.5% Reference
GUID-8A5213CB-CB57-48BC-982E-2E4292ECAE02-low.gifFigure 9-13 Delay Timer
GUID-3EA14588-BFA9-43C9-81D2-959BDBC62C39-low.gifFigure 9-15 Precision Constant-Current Sink
GUID-AC129FD8-5840-4FB3-8FE0-CAAFD073AA52-low.gifFigure 9-4 Single-Supply Comparator With Temperature-Compensated Threshold
GUID-36E6DAEB-0EE3-4351-933F-9FCD9F9F63FA-low.gifFigure 9-6 Output Control of a Three-Terminal Fixed Regulator
GUID-19992A56-F561-4BA2-9778-AE21C914B3D2-low.gif
See the stability boundary conditions in Figure 6-16 to determine allowable values for C.
Figure 9-8 Crowbar
GUID-514BCC53-462C-4841-9561-4EC468BD6EB1-low.gif
Rb must provide cathode current ≥1 mA to the TL1431.
Figure 9-10 5-V Precision Regulator
GUID-28140574-6C01-4DAF-80A4-6E98A51F950F-low.gif
Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL1431.
Figure 9-12 Voltage Monitor
GUID-08BC3BD3-6E27-4D6E-ACC8-83031D85FCE7-low.gifFigure 9-14 Precision Current Limiter