SLVSDQ6A July   2018  – November 2018 TL431LI , TL432LI

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 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
    6. 7.6 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Temperature Coefficient
    2. 8.2 Dynamic Impedance
  9. 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 Precision Constant Current Sink
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
          1. 10.2.2.2.1 Basic Operation
            1. 10.2.2.2.1.1 Output Current Range and Accuracy
          2. 10.2.2.2.2 Power Consumption
      3. 10.2.3 Shunt Regulator/Reference
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
          1. 10.2.3.2.1 Programming Output/Cathode Voltage
          2. 10.2.3.2.2 Total Accuracy
          3. 10.2.3.2.3 Stability
          4. 10.2.3.2.4 Start-up Time
        3. 10.2.3.3 Application Curve
      4. 10.2.4 Isolated Flyback with Optocoupler
        1. 10.2.4.1 Design Requirements
          1. 10.2.4.1.1 Detailed Design Procedure
            1. 10.2.4.1.1.1 TL431 Feedback Loop Error Calculation
    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 Related Links
    2. 13.2 Documentation Support
      1. 13.2.1 Device Nomenclature
      2. 13.2.2 Related Documentation
    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

7.6 Typical Characteristics

Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices.

TL431LI TL432LI D001VrefvsTemp2.gifFigure 1. Reference Voltage vs Free-Air Temperature
TL431LI TL432LI D003VkavsIkaTL431.gifFigure 3. Cathode Current vs Cathode Voltage
TL431LI TL432LI D0006deltav.gifFigure 5. Ratio of Delta Reference Voltage to Delta Cathode Voltage vs Free-Air Temperature
TL431LI TL432LI D002IrefvsTemp.gifFigure 2. Reference Current vs Free-Air Temperature
TL431LI TL432LI D004Ioff.gifFigure 4. Off-State Cathode Current
vs Free-Air Temperature
TL431LI TL432LI GainandPhase_v2.gifFigure 6. Small-Signal Voltage Amplification
vs Frequency
TL431LI TL432LI D005Zkavsf.gifFigure 8. Reference Impedance vs Frequency
TL431LI TL432LI pulseresponse.gifFigure 10. Pulse Response
TL431LI TL432LI TL431_Stability.gif
A. The areas under the curves represent conditions that may cause the device to oscillate. For curves B and C, R2 and V+ are adjusted to establish the initial VKA and IKA conditions, with CL = 0. VBATT and CL then are adjusted to determine the ranges of stability.
 
Figure 12. Stability Boundary Conditions for All TL431LI, TL432LI Devices
TL431LI TL432LI tc_4_2_lvs543.gifFigure 7. Test Circuit for Voltage Amplification
TL431LI TL432LI tc_4_4_lvs543.gif
Figure 9. Test Circuit for Reference Impedance
TL431LI TL432LI tc_5_2_lvs543.gifFigure 11. Test Circuit for Pulse Response
TL431LI TL432LI tc_6_2_lvs543.gifFigure 13. Test Circuits for Stability Boundary Conditions