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

8.4.1 Open Loop (Comparator)

When the cathode or output voltage or current of the TL43x-Q1 is not being fed back to the reference or input pin in any form, the device operates in open loop. With proper cathode current (IKA) applied to this device, the TL43x-Q1 has the characteristics shown in Figure 24. With such high gain in this configuration, the device is typically used as a comparator. The integrated reference makes TL43x the prefered choice when trying to monitor a certain level of a single signal for applications such as undervoltage and overvoltage detection.

When designing with open loop mode, it is important to ensure that the IREF not violate 10mA. For design recommendations and considerations for open loop mode look into Using the TL431 for Undervoltage and Overvoltage Detection.