Datasheet TL432LI-Q1 (Texas Instruments) - 7

TL431LI-Q1 TL432LI-Q1 www.ti.com
SNVSBA4A – MAY 2019 – REVISED NOVEMBER 2019
Typical Characteristics (continued)
I 100 KA = 10 mA T I A = 25°C 50 KA = 1 mA ms TA = 25°C Oh 30 - 20 e c Output an 10 I d KA 15 kΩ 232 Ω pe 5 Im 3 ce 2 9 µF ren + e 1 ef - R 0.5 − | A 0.3 8.25 kΩ K|Z 0.2 0.1 GND 1k 10k 100k 1M f - Frequency - Hz
Figure 7. Test Circuit for Voltage Amplification Figure 8. Reference Impedance versus Frequency
6 1 kΩ T Output Input A = 25qC 5 - V ge IKA 4 olta t V 50 Ω pu 3 Output − d Out 2 ut an + Inp 1 GND 0 -1 0 1 2 3 4 5 6 7 t - Time - Ps puls
Figure 9. Test Circuit for Reference Impedance Figure 10. Pulse Response
15 220 Ω A VKA = Vref Output B VKA = 5 V 12 C VKA = 10 V t - mA Pulse Stable Region en Generator 50 Ω 9 f = 100 kHz e Curr od 6 ath - C GND AIK 3 0 0.001 0.01 0.1 1 10 CL - Load Capacitance - µF C To Lpy 43 The areas under the curves represent conditions that may cause the device to oscillate. For curves B and C, R2 and V+ are adjusted to establish the initial VKA and IKA conditions, with CL = 0. VBATT and CL then are adjusted to determine the ranges of stability.
Figure 11. Test Circuit for Pulse Response Figure 12. Stability Boundary Conditions for All TL431LI-Q1, TL432LI-Q1 Devices
Copyright © 2019, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TL431LI-Q1 TL432LI-Q1 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 Recommended Operating Conditions 7.4 Thermal Information 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 10.2.2 Design Requirements 10.2.3 Detailed Design Procedure 10.2.3.1 Basic Operation 10.2.3.2 Output Voltage and Logic Input Level 10.2.4 Application Curves 10.2.5 Precision LED Lighting Current Sink Regulator 10.2.5.1 Design Requirements 10.2.5.2 Detailed Design Procedure 10.2.6 Shunt Regulator/Reference 10.2.6.1 Design Requirements 10.2.6.2 Detailed Design Procedure 10.2.6.3 Application Curves 10.2.7 Isolated Flyback with Optocoupler 10.2.7.1 Design Requirements 10.2.7.2 Detailed Design Procedure 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 Device Support 13.1.1 Device Nomenclature 13.2 Documentation Support 13.2.1 Related Documentation 13.3 Related Links 13.4 Receiving Notification of Documentation Updates 13.5 Support Resources 13.6 Trademarks 13.7 Electrostatic Discharge Caution 13.8 Glossary 14 Mechanical, Packaging, and Orderable Information