Datasheet ATL432LI (Texas Instruments) - 10
| 制造商 | Texas Instruments |
| 描述 | High-bandwidth, low-IQ programmable shunt regulator (pinout: RKA) |
| 页数 / 页 | 40 / 10 — ATL431LI. ATL432LI. www.ti.com. 9.2 Dynamic Impedance. Figure 20. Dynamic … |
| 文件格式/大小 | PDF / 1.4 Mb |
| 文件语言 | 英语 |
ATL431LI. ATL432LI. www.ti.com. 9.2 Dynamic Impedance. Figure 20. Dynamic Impedance
文件文字版本
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ATL431LI ATL432LI
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
www.ti.com 9.2 Dynamic Impedance
' K V A K Z A The dynamic impedance is defined as: ' K I A . When the device is operating with two external resistors 'V z' (see Figure 18), the total dynamic impedance of the circuit is given by: 'I which is approximately equal to § R1 · K Z A ¨1 ¸ © R2 ¹ . The VKA of the ATL431LI can be affected by the dynamic impedance. The ATL431LI test current Itest for VKA is specified on the Eletrical Characteristics . Any deviation from Itest can cause deviation on the output VKA. Figure 20 shows the effect of the dynamic impedance on the VKA. ) A (m A I I K test / P IKA IKA(min) 0 VKA (V) Ps
Figure 20. Dynamic Impedance
10 Submit Documentation Feedback Copyright © 2017–2019, Texas Instruments Incorporated 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
ATL431LI ATL432LI
SLVSDU6D – JULY 2017 – REVISED NOVEMBER 2019
www.ti.com 9.2 Dynamic Impedance
' K V A K Z A The dynamic impedance is defined as: ' K I A . When the device is operating with two external resistors 'V z' (see Figure 18), the total dynamic impedance of the circuit is given by: 'I which is approximately equal to § R1 · K Z A ¨1 ¸ © R2 ¹ . The VKA of the ATL431LI can be affected by the dynamic impedance. The ATL431LI test current Itest for VKA is specified on the Eletrical Characteristics . Any deviation from Itest can cause deviation on the output VKA. Figure 20 shows the effect of the dynamic impedance on the VKA. ) A (m A I I K test / P IKA IKA(min) 0 VKA (V) Ps
Figure 20. Dynamic Impedance
10 Submit Documentation Feedback Copyright © 2017–2019, Texas Instruments Incorporated 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