Datasheet TL431, TL431A, TL431B, TL432, TL432A, TL432B (Texas Instruments) - 9

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TL431 , TL431A, TL431B TL432 , TL432A, TL432B www.ti.com
SLVS543O – AUGUST 2004 – REVISED JANUARY 2015
7.9 Electrical Characteristics, TL431AI, TL432AI
over recommended operating conditions, TA = 25°C (unless otherwise noted)
TL431AI, TL432AI PARAMETER TEST CIRCUIT TEST CONDITIONS UNIT MIN TYP MAX
Vref Reference voltage See Figure 20 VKA = Vref, IKA = 10 mA 2470 2495 2520 mV SOT23-3 and TL432 Deviation of reference input 14 34 VKA = Vref, devices VI(dev) voltage over full temperature See Figure 20 mV IKA = 10 mA range(1) All other devices 5 50 Ratio of change in reference ΔVKA = 10 V – Vref –1.4 –2.7 ΔVref / voltage to the change in See Figure 21 IKA = 10 mA mV/V ΔVKA ΔVKA = 36 V – 10 V –1 –2 cathode voltage Iref Reference input current See Figure 21 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 2 4 µA Deviation of reference input II(dev) current over full temperature See Figure 21 IKA = 10 mA, R1 = 10 kΩ, R2 = ∞ 0.8 2.5 µA range(1) Minimum cathode current for Imin See Figure 20 VKA = Vref 0.4 0.7 mA regulation Ioff Off-state cathode current See Figure 22 VKA = 36 V, Vref = 0 0.1 0.5 µA |zKA| Dynamic impedance(2) See Figure 20 VKA = Vref, f ≤ 1 kHz, IKA = 1 mA to 100 mA 0.2 0.5 Ω (1) 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: αVref is positive or negative, depending on whether minimum V ∆ ref or maximum Vref, respectively, occurs at the lower temperature. VKA |z | = KA (2) The dynamic impedance is defined as: ∆IKA ∆V |z'| = When the device is operating with two external resistors (see Figure 21), the total dynamic impedance of the circuit is given by: ∆I R1 |z | (1 + ( KA which is approximately equal to R2 . Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TL431 TL431A TL431B TL432 TL432A TL432B Document Outline 1 Features 2 Applications 3 Description 4 Simplified Schematic Table of Contents 5 Revision History 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, TL431C, TL432C 7.6 Electrical Characteristics, TL431I, TL432I 7.7 Electrical Characteristics, TL431Q, TL432Q 7.8 Electrical Characteristics, TL431AC, TL432AC 7.9 Electrical Characteristics, TL431AI, TL432AI 7.10 Electrical Characteristics, TL431AQ, TL432AQ 7.11 Electrical Characteristics, TL431BC, TL432BC 7.12 Electrical Characteristics, TL431BI, TL432BI 7.13 Electrical Characteristics, TL431BQ, TL432BQ 7.14 Typical Characteristics 8 Parameter Measurement Information 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 Curves 10.2.2 Shunt Regulator/Reference 10.2.2.1 Design Requirements 10.2.2.2 Detailed Design Procedure 10.2.2.3 Application Curves 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 Trademarks 13.3 Electrostatic Discharge Caution 13.4 Glossary 14 Mechanical, Packaging, and Orderable Information