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

Electrical Characteristics, TL431C, TL432C

over recommended operating conditions, TA = 25°C (unless otherwise noted)
PARAMETER TEST CIRCUIT TEST CONDITIONS TL431C, TL432C UNIT
MIN TYP MAX
Vref Reference voltage See Figure 20 VKA = Vref, IKA = 10 mA 2440 2495 2550 mV
VI(dev) Deviation of reference input voltage over full temperature range(1) See Figure 20 VKA = Vref,
IKA = 10 mA,
SOT23-3 and TL432 devices 6 16 mV
All other devices 4 25
ΔVref / ΔVKA Ratio of change in reference voltage to the change in cathode voltage See Figure 21 IKA = 10 mA ΔVKA = 10 V – Vref –1.4 –2.7 mV/V
ΔVKA = 36 V – 10 V –1 –2
Iref Reference input current See Figure 21 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 2 4 µA
II(dev) Deviation of reference input current over full temperature range(1) See Figure 21 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 0.4 1.2 µA
Imin Minimum cathode current for regulation See Figure 20 VKA = Vref 0.4 1 mA
Ioff Off-state cathode current See Figure 22 VKA = 36 V, Vref = 0 0.1 1 µA
|zKA| Dynamic impedance(2) See Figure 20 VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA 0.2 0.5
The deviation parameters Vref(dev) and Iref(dev) are defined as the differences between the maximum and minimum values obtained over the rated temperature range. The average full-range temperature coefficient of the reference input voltage αVref is defined as:
TL431 TL432 note_aviref_lvs543.gif
αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature.
The dynamic impedance is defined as: TL431 TL432 eq_def_zka.gif
When the device is operating with two external resistors (see Figure 21), the total dynamic impedance of the circuit is given by: TL431 TL432 eq_zprm.gif which is approximately equal to TL431 TL432 eq_zprm_app_eq.gif.