Datasheet ATL432LI (Texas Instruments) - 9

ATL431LI ATL432LI www.ti.com
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
9 Parameter Measurement Information
Input VKA IKA Vref
Figure 17. 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 18. Test Circuit for VKA > Vref
Input VKA Ioff
Figure 19. Test Circuit for Ioff 9.1 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 © 2017–2019, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: ATL431LI ATL432LI 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 8 Typical Characteristics 9 Parameter Measurement Information 9.1 Temperature Coefficient 9.2 Dynamic Impedance 10 Detailed Description 10.1 Overview 10.2 Functional Block Diagram 10.3 Feature Description 10.4 Device Functional Modes 10.4.1 Open Loop (Comparator) 10.4.2 Closed Loop 11 Applications and Implementation 11.1 Application Information 11.2 Typical Applications 11.2.1 Comparator With Integrated Reference 11.2.1.1 Design Requirements 11.2.1.2 Detailed Design Procedure 11.2.1.3 Application Curve 11.2.2 Precision Constant Current Sink 11.2.2.1 Design Requirements 11.2.2.2 Detailed Design Procedure 11.2.3 Shunt Regulator/Reference 11.2.3.1 Design Requirements 11.2.3.2 Detailed Design Procedure 11.2.3.3 Application Curve 11.2.4 Isolated Flyback with Optocoupler 11.2.4.1 Design Requirements 11.3 System Examples 12 Power Supply Recommendations 13 Layout 13.1 Layout Guidelines 13.2 SOT23-3 Layout Example 13.3 X2SON (DQN) Layout Example 13.4 Thermal Considerations 14 Device and Documentation Support 14.1 Documentation Support 14.1.1 Device Nomenclature 14.1.2 Related Documentation 14.2 Related Links 14.3 Receiving Notification of Documentation Updates 14.4 Community Resources 14.5 Trademarks 14.6 Electrostatic Discharge Caution 14.7 Glossary 15 Mechanical, Packaging, and Orderable Information