ZHCSD58G June   2012  – November 2017 LM34925

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用原理图
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Control Overview
      2. 7.3.2  VCC Regulator
      3. 7.3.3  Regulation Comparator
      4. 7.3.4  Overvoltage Comparator
      5. 7.3.5  On-Time Generator
      6. 7.3.6  Current Limit
      7. 7.3.7  N-Channel Buck Switch and Driver
      8. 7.3.8  Synchronous Rectifier
      9. 7.3.9  Undervoltage Detector
      10. 7.3.10 Thermal Protection
      11. 7.3.11 Ripple Configuration
      12. 7.3.12 Soft Start
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Application Circuit: 20-V to 95-V Input and 10-V, 100-mA Output Isolated Fly-Buck Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Transformer Turns Ratio
          2. 8.2.1.2.2  Total IOUT
          3. 8.2.1.2.3  RFB1, RFB2
          4. 8.2.1.2.4  Frequency Selection
          5. 8.2.1.2.5  Transformer Selection
          6. 8.2.1.2.6  Primary Output Capacitor
          7. 8.2.1.2.7  Secondary Output Capacitor
          8. 8.2.1.2.8  Type III Feedback Ripple Circuit
          9. 8.2.1.2.9  Secondary Diode
          10. 8.2.1.2.10 VCC and Bootstrap Capacitor
          11. 8.2.1.2.11 Input Capacitor
          12. 8.2.1.2.12 UVLO Resistors
          13. 8.2.1.2.13 VCC Diode
      2. 8.2.2 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 文档支持
      1. 11.1.1 相关文档
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 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 F Revision (November 2014) to G Revision

  • Deleted lead temperature and related footnote from Abs Max tableGo
  • Changed /moved Storage temp from Handling ratings to Absolute Maximum Ratings, changed Handling ratings title to ESD ratingsGo
  • Changed 14 V to 13 V in the VCC Regulator section Go

Changes from E Revision (December 2013) to F Revision

  • Added 引脚配置和功能 部分、处理额定值 表、开关特性 表、功能 说明 部分、器件功能模式、应用和实施 部分、电源建议 部分、布局 部分、器件和文档支持 部分，以及机械、封装和可订购信息 部分Go
  • Changed Thermal Information tableGo
  • Changed TON vs VIN and RON in Typical CharacteristicsGo
  • Changed Control Overview section, Ripple Configuration tableGo
  • Changed Soft-Start Circuit, Isolated Fly-Buck Converter graphics.Go

Changes from D Revision (December 2013) to E Revision

  • Added Thermal ParametersGo

Changes from C Revision (September 2013) to D Revision

  • Changed 按照 TI 标准，对文档格式进行了通篇更改Go
  • Changed 将特性、引脚说明 和建议运行条件 中的最低工作输入电压由 9V 更改为 7.5VGo
  • Added Absolute Maximum Junction TemperatureGo

Changes from B Revision (September, 2013) to C Revision

  • Added SW to RTN (100-ns transient) in Absolute Maximum Ratings Go

Changes from A Revision (February 2013) to B Revision

  • Changed layout of National Data Sheet to TI formatGo