ZHCSDU5 December   2014 LM5021-Q1

PRODUCTION DATA.  

1. 1 特性
2. 2 應用
3. 3 說明
4. 4 修訂歷史記錄
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器件和文檔支持
    1. 11.1 商標
    2. 11.2 靜電放電警告
    3. 11.3 Glossary
12. 12機械、封裝和可訂購信息