SLVS062O December   1991  – October 2025 TL1431 , TL1431M

PRODUCTION DATA  

  1.   1
  2. Features
  3. Applications
  4. Description
  5. Pin Configuration and Functions
  6. Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings – TL1431C, TL1431Q
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics – TL1431C
    6. 5.6 Electrical Characteristics – TL1431Q
    7. 5.7 Electrical Characteristics – TL1431M
    8. 5.8 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Open Loop (Comparator)
      2. 7.4.2 Closed Loop
  9. Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Programming Output/Cathode Voltage
        2. 8.2.2.2 Total Accuracy
        3. 8.2.2.3 Stability
        4. 8.2.2.4 Start-up Time
      3. 8.2.3 Application Curve
    3. 8.3 System Examples
  10. Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Third-Party Products Disclaimer
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    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. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Typical Characteristics

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

Table 5-1 Table Of Graphs
GRAPHFIGURE
Reference voltage vs Free-air temperatureFigure 5-1
Reference current vs Fire-air temperatureFigure 5-2
Cathode current vs Cathode voltageFigure 5-3, Figure 5-4
Off-state cathode current vs Free-air temperatureFigure 5-5
Ratio of delta reference voltage to delta cathode voltage vs Free-air temperatureFigure 5-6
Equivalent input-noise voltage vs FrequencyFigure 5-7
Equivalent input-noise voltage over a 10 second periodFigure 5-8
Small-signal voltage amplification vs FrequencyFigure 5-9
Reference impedance vs FrequencyFigure 5-10
Pulse responseFigure 5-11
Stability boundary conditionsFigure 5-12
TL1431 TL1431M Reference Voltage vs Free-Air TemperatureFigure 5-1 Reference Voltage vs Free-Air Temperature
TL1431 TL1431M Cathode Current vs Cathode VoltageFigure 5-3 Cathode Current vs Cathode Voltage
TL1431 TL1431M Off-State Cathode Current vs Free-Air TemperatureFigure 5-5 Off-State Cathode Current vs Free-Air Temperature
TL1431 TL1431M Equivalent Input-Noise Voltage vs FrequencyFigure 5-7 Equivalent Input-Noise Voltage vs Frequency
TL1431 TL1431M Small-Signal Voltage Amplification vs FrequencyFigure 5-9 Small-Signal Voltage Amplification vs Frequency
TL1431 TL1431M Pulse
                        Response
Figure 5-11 Pulse Response
TL1431 TL1431M Reference Current vs Free-Air TemperatureFigure 5-2 Reference Current vs Free-Air Temperature
TL1431 TL1431M Cathode Current vs Cathode VoltageFigure 5-4 Cathode Current vs Cathode Voltage
TL1431 TL1431M Ratio Of Delta Reference Voltage To Delta Cathode Voltage vs Free-Air TemperatureFigure 5-6 Ratio Of Delta Reference Voltage To Delta Cathode Voltage vs Free-Air Temperature
TL1431 TL1431M Equivalent Input-Noise
                        Voltage Over A 10S PeriodFigure 5-8 Equivalent Input-Noise Voltage Over A 10S Period
TL1431 TL1431M Reference Impedance vs FrequencyFigure 5-10 Reference Impedance vs Frequency
TL1431 TL1431M Stability Boundary Conditions
The areas under the curves represent conditions that may cause the device to oscillate. For curves B, C, and D, 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 5-12 Stability Boundary Conditions