SGLS302G March   2005  – May 2020 TL431-Q1 , TL432-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin 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: TL43x-Q1
    6. 6.6 Electrical Characteristics: TL43xA-Q1
    7. 6.7 Electrical Characteristics: TL43xB-Q1
    8. 6.8 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 Applications
      1. 9.2.1 Comparator Application
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Basic Operation
          2. 9.2.1.2.2 Overdrive
          3. 9.2.1.2.3 Output Voltage and Logic Input Level
          4. 9.2.1.2.4 Input Resistance
          5. 9.2.1.2.5 Deviation Parameters and Calculating Dynamic Impedance
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Other Application Circuits
  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 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DBZ|3
  • DBV|5
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9.2.1.2.5 Deviation Parameters and Calculating Dynamic Impedance

The deviation parameters, VI(DEV) and II(DEV), are defined as the differences between the maximum and minimum values obtained over the recommended temperature range. The average full-range temperature coefficient of the reference voltage (αVref) is defined in Equation 1.

Equation 1. TL431-Q1 TL432-Q1 equ_and_graph_01_SGLS302.gif

where

  • ΔTA is the recommended operating free-air temperature range of the device

αVref can be positive or negative, depending on whether minimum VREF or maximum VREF, respectively, occurs at the lower temperature.

Example:

Maximum VREF = 2496 mV at 30°C, minimum VREF = 2492 mV at 0°C, VREF = 2495 mV at 25°C, ΔTA = 70°C for TL43x.

Equation 2. TL431-Q1 TL432-Q1 equ_02_SGLS302.gif

Because minimum VREF occurs at the lower temperature, the coefficient is positive.

The dynamic impedance is defined as |ZKA| = ΔVKA / ΔIKA.

When the device is operating with two external resistors, see Figure 21, the total dynamic impedance of the circuit is given by Equation 3.

Equation 3. TL431-Q1 TL432-Q1 equ_03_cal_dev_para_SGLS302.gif