SLVS062O December   1991  – October 2025 TL1431 , TL1431M

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 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. 6 Parameter Measurement Information
  8. 7 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. 8 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. 9 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

5.7 Electrical Characteristics – TL1431M

at specified free-air temperature and IKA = 10mA (unless otherwise noted)
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
VI(ref)Reference input voltageVKA = VI(ref)
(see Figure 6-1)		TA = 25°C247525002540mV
TA = –55°C to 125°C24602550
VI(dev)Deviation of reference input voltage over full temperature range(1)VKA = VI(ref), TA = –55°C to 125°C
(see Figure 6-1)		1755(2)mV
TL1431 TL1431M Ratio of change in reference input voltage to the change in cathode voltageΔVKA = 3V to 36V, TA = –55°C to 125°C
(see Figure 6-2)		–1.1–2mV/V
II(ref)Reference input currentR1 = 10kΩ, R2 = ∞
(see Figure 6-2)		TA = 25°C1.52.5µA
TA = –55°C to 125°C5
II(dev)Deviation of reference input current over full temperature range(1)R1 = 10kΩ, R2 = ∞, TA = –55°C to 125°C
(see Figure 6-2)		0.53(2)µA
IminMinimum cathode current for regulationVKA = VI(ref), TA = 25°C (see Figure 6-1)0.451mA
IoffOff-state cathode currentVKA = 36V, VI(ref) = 0
(see Figure 6-3)		TA = 25°C0.180.5µA
TA = –55°C to 125°C2
|zKA|Output impedance(3)VKA = VI(ref), f ≤ 1kHz,
IKA = 1mA to 100mA, TA = 25°C
(see Figure 6-1)		0.20.4Ω
(1) The deviation parameters VI(dev) and II(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 αVI(ref) is defined as:
TL1431 TL1431M
αVI(ref) is positive or negative, depending on whether minimum VI(ref) or maximum VI(ref), respectively, occurs at the lower temperature.
(2) On products compliant to MIL-PRF-38535, this parameter is not production tested.
(3) The output impedance is defined as: TL1431 TL1431M
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: TL1431 TL1431M , which is approximately equal to TL1431 TL1431M .