ZHCSND8 april   2021 LM117QML-SP

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configurations and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics: 0.5–A IOUT Devices (LM117H, LM117GW)
    6. 7.6  Parameter Drift: 0.5–A IOUT Devices (LM117H, LM117GW)
    7. 7.7  Electrical Characteristics: 1.5–A IOUT Devices (LM117K)
    8. 7.8  Parameter Drift: 1.5–A IOUT Devices (LM117K)
    9. 7.9  Quality Conformance Inspection
    10. 7.10 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Setting Output Voltage
    4. 8.4 External Capacitors
    5. 8.5 Load Regulation
    6. 8.6 Protection Diodes
  9. 9 Application and Implementation
    1. 9.1 Typical Applications
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 第三方产品免责声明
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 接收文档更新通知
    4. 12.4 支持资源
    5. 12.5 Trademarks
    6. 12.6 静电放电警告
    7. 12.7 术语表

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.5 Load Regulation

The LM117 is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum performance. The current set resistor connected between the adjustment terminal and the output terminal (usually 240 Ω) should be tied directly to the output (case) of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15-V regulator with 0.05-Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05 Ω × IL. If the set resistor is connected near the load the effective line resistance will be 0.05 Ω (1 + R2 / R1) or in this case, 11.5 times worse.

Figure 8-3 shows the effect of resistance between the regulator and 240-Ω set resistor.

GUID-0777C8D9-A07C-4BBF-8BEA-69A349313AD7-low.pngFigure 8-3 Regulator With Line Resistance in Output Lead

With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two separate leads to the case. However, with the TO-39 package, care should be taken to minimize the wire length of the output lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation.