Datasheet TL432LI (Texas Instruments) - 9

TL431LI TL432LI www.ti.com
SLVSDQ6A – JULY 2018 – REVISED NOVEMBER 2018
8 Parameter Measurement Information
Input VKA IKA Vref
Figure 14. Test Circuit for VKA = Vref
Input VKA IKA R1 Iref R2 Vref æ R1 ö K V A = r V ef ç1 + ÷ + rIef × R1 è R2 ø
Figure 15. Test Circuit for VKA > Vref
Input VKA Ioff
Figure 16. Test Circuit for Ioff 8.1 Temperature Coefficient
The deviation of the reference voltage, Vref, over the full temperature range is known as VI(dev). The parameter of VI(dev) can be used to find the temperature coefficient of the device. The average full-range temperature coefficient of the reference input voltage, αVref, is defined as: αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the lower temperature. The full-range temperature coefficient is an average and therefore any subsection of the rated operating temperature range can yield a value that is greater or less than the average. For more details on temperature coefficient, check out Voltage Reference Selection Basics. Copyright © 2018, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TL431LI TL432LI Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Device Comparison Table 6 Pin Configuration and Functions 7 Specifications 7.1 Absolute Maximum Ratings 7.2 ESD Ratings 7.3 Thermal Information 7.4 Recommended Operating Conditions 7.5 Electrical Characteristics 7.6 Typical Characteristics 8 Parameter Measurement Information 8.1 Temperature Coefficient 8.2 Dynamic Impedance 9 Detailed Description 9.1 Overview 9.2 Functional Block Diagram 9.3 Feature Description 9.4 Device Functional Modes 9.4.1 Open Loop (Comparator) 9.4.2 Closed Loop 10 Applications and Implementation 10.1 Application Information 10.2 Typical Applications 10.2.1 Comparator With Integrated Reference 10.2.1.1 Design Requirements 10.2.1.2 Detailed Design Procedure 10.2.1.3 Application Curve 10.2.2 Precision Constant Current Sink 10.2.2.1 Design Requirements 10.2.2.2 Detailed Design Procedure 10.2.3 Shunt Regulator/Reference 10.2.3.1 Design Requirements 10.2.3.2 Detailed Design Procedure 10.2.3.3 Application Curve 10.2.4 Isolated Flyback with Optocoupler 10.2.4.1 Design Requirements 10.3 System Examples 11 Power Supply Recommendations 12 Layout 12.1 Layout Guidelines 12.2 Layout Example 13 Device and Documentation Support 13.1 Related Links 13.2 Documentation Support 13.2.1 Device Nomenclature 13.2.2 Related Documentation 13.3 Receiving Notification of Documentation Updates 13.4 Community Resources 13.5 Trademarks 13.6 Electrostatic Discharge Caution 13.7 Glossary 14 Mechanical, Packaging, and Orderable Information