ZHCSDU4E May   2005  – December 2014 LM5021

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operation Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Performance Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM Comparator and Slope Compensation
      2. 7.3.2 Current Limit and Current Sense
      3. 7.3.3 Oscillator, Shutdown and Sync Capability
      4. 7.3.4 Gate Driver and Max Duty Cycle Limit
      5. 7.3.5 Soft-Start
      6. 7.3.6 Hiccup Mode Overload Current Limiting
      7. 7.3.7 Skip Cycle Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation With VIN Below 20 V
      2. 7.4.2 Operation in Soft Start
      3. 7.4.3 Operation Under Normal Conditions
      4. 7.4.4 Operation in Skip Cycle
      5. 7.4.5 Operation at Overload
      6. 7.4.6 Operation in Hiccup Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Startup Circuit
      2. 8.1.2 Relationship Between Input Capacitor CIN and VCC Capacitor CVCC
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Primary Bulk Capacitance
        2. 8.2.2.2 Transformer
        3. 8.2.2.3 Main Switch FET and Output Rectifier
        4. 8.2.2.4 Timing Resistor
        5. 8.2.2.5 Soft-Start Time
        6. 8.2.2.6 Current Sensing Network
          1. 8.2.2.6.1 Gate Drive Resistor
          2. 8.2.2.6.2 VCC Capacitor
          3. 8.2.2.6.3 Startup Circuit
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 商标
    2. 11.2 静电放电警告
    3. 11.3 Glossary
  12. 12机械、封装和可订购信息

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

4 修订历史记录

Changes from D Revision (March 2013) to E Revision

  • 已添加、更新或修改以下部分：引脚配置和功能；技术规格；详细说明；应用和实施；电源相关建议；布局；器件和文档支持以及机械、封装和可订购信息Go

Changes from C Revision (March 2013) to D Revision

  • Changed layout of National Data Sheet to TI formatGo