ZHCSH33Z September   1997  – April 2025 LM317

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information (Legacy Chip)
    5. 6.5 Thermal Information (New Chip)
    6. 6.6 Electrical Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 NPN Darlington Output Drive
      2. 7.3.2 Overload Block
      3. 7.3.3 Programmable Feedback
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Operation With Low Input Voltage
      3. 7.4.3 Operation at Light Loads
      4. 7.4.4 Operation In Self Protection
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1  0V to 30V Regulator Circuit
      2. 8.3.2  Adjustable Regulator Circuit With Improved Ripple Rejection
      3. 8.3.3  Precision Current-Limiter Circuit
      4. 8.3.4  Tracking Preregulator Circuit
      5. 8.3.5  1.25V to 20V Regulator Circuit With Minimum Program Current
      6. 8.3.6  Battery-Charger Circuit
      7. 8.3.7  50mA, Constant-Current, Battery-Charger Circuit
      8. 8.3.8  Slow Turn-On 15V Regulator Circuit
      9. 8.3.9  AC Voltage-Regulator Circuit
      10. 8.3.10 Current-Limited 6V Charger Circuit
      11. 8.3.11 Adjustable 4A Regulator Circuit
      12. 8.3.12 High-Current Adjustable Regulator Circuit
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Thermal Considerations
          1. 8.5.1.1.1 Heat Sink Requirements
          2. 8.5.1.1.2 Heat Sinking Surface-Mount Packages
            1. 8.5.1.1.2.1 Heatsinking the SOT-223 (DCY) Package
            2. 8.5.1.1.2.2 Heat Sinking the TO-263 (KTT) Package
      2. 8.5.2 Layout Examples
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

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8.5.1.1.2.1 Heatsinking the SOT-223 (DCY) Package

Figure 8-19 and Figure 8-20 show information for the SOT-223 package. Figure 8-20 assumes a RθJA of 74°C/W for 1oz. copper and 59.6°C/W for 2oz. copper (further details are in Section 6.5) and a maximum junction temperature of 125°C. See the AN-1028 Maximum Power Enhancement Techniques for Power Packages application note for thermal enhancement techniques to be used with the SOT-223 and TO-252 packages.

LM317 RθJA vs Copper (2oz.) Area for the SOT-223 PackageFigure 8-19 RθJA vs Copper (2oz.) Area for the SOT-223 Package
LM317 Maximum Power Dissipation vs TAMB for the SOT-223 PackageFigure 8-20 Maximum Power Dissipation vs TAMB for the SOT-223 Package