SLVS543P August   2004  – November 2018 TL431 , TL432

PRODUCTION DATA.  

  1. Features
  2. Applications
    1.     Simplified Schematic
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1.     Pin Functions
  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
  8. Parameter Measurement Information
  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
  10. 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
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Nomenclature
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

System Examples

TL431 TL432 ai_prec_hi_curr_ser_lvs543.gif
R should provide cathode current ≥1 mA to the TL431 at minimum V(BATT).
Figure 29. Precision High-Current Series Regulator
TL431 TL432 ai_out_ctrl_3term_lvs543.gifFigure 30. Output Control of a Three-Terminal Fixed Regulator
TL431 TL432 ai_high_curr_shunt_lvs543.gifFigure 31. High-Current Shunt Regulator
TL431 TL432 ai_crowbar_lvs543.gif
Refer to the stability boundary conditions in Figure 16 and Figure 18 to determine allowable values for C.
Figure 32. Crowbar Circuit
TL431 TL432 ai_prec_5v_1p5a_reg_lvs543.gifFigure 33. Precision 5-V, 1.5-A Regulator
TL431 TL432 ai_efficient_5v_lvs543.gif
Rb should provide cathode current ≥1 mA to the TL431.
Figure 34. Efficient 5-V Precision Regulator
TL431 TL432 ai_pwm_conv_lvs543.gifFigure 35. PWM Converter With Reference
TL431 TL432 ai_voltage_monitor_lvs543.gif
Select R3 and R4 to provide the desired LED intensity and cathode current ≥1 mA to the TL431 at the available VI(BATT).
Figure 36. Voltage Monitor
TL431 TL432 ai_delay_timer_lvs543.gifFigure 37. Delay Timer
TL431 TL432 ai_prec_curr_limit_lvs543.gifFigure 38. Precision Current Limiter
TL431 TL432 ai_prec_const_curr_lvs543.gifFigure 39. Precision Constant-Current Sink