ZHCSD64G December   2012  – May 2021 LM25018

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Characteristics
    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 Applications
      1. 8.2.1 Application Circuit: 12.5-V to 48-V Input and 10-V, 325-mA Output Buck Converter
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 RFB1, RFB2
          3. 8.2.1.2.3 Frequency Selection
          4. 8.2.1.2.4 Inductor Selection
          5. 8.2.1.2.5 Output Capacitor
          6. 8.2.1.2.6 Type III Ripple Circuit
          7. 8.2.1.2.7 VCC and Bootstrap Capacitor
          8. 8.2.1.2.8 Input Capacitor
          9. 8.2.1.2.9 UVLO Resistors
      2. 8.2.2 Application Curves
      3. 8.2.3 Typical Isolated DC-DC Converter Using LM25018
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
          1. 8.2.3.2.1  Transformer Turns Ratio
          2. 8.2.3.2.2  Total IOUT
          3. 8.2.3.2.3  RFB1, RFB2
          4. 8.2.3.2.4  Frequency Selection
          5. 8.2.3.2.5  Transformer Selection
          6. 8.2.3.2.6  Primary Output Capacitor
          7. 8.2.3.2.7  Secondary Output Capacitor
          8. 8.2.3.2.8  Type III Feedback Ripple Circuit
          9. 8.2.3.2.9  Secondary Diode
          10. 8.2.3.2.10 VCC and Bootstrap Capacitor
          11. 8.2.3.2.11 Input Capacitor
          12. 8.2.3.2.12 UVLO Resistors
          13. 8.2.3.2.13 VCC Diode
        3. 8.2.3.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 第三方产品免责声明
      2. 11.1.2 Development Support
        1. 11.1.2.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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 Revision History

Changes from Revision F (November 2017) to Revision G (May 2021)

  • 在标题中添加了“同步 Fly-Buck”Go
  • 添加了超链接的应用 要点Go
  • 更新了整个文档中的表格、图和交叉参考的编号格式Go

Changes from Revision E (November 2015) to Revision F (November 2017)

  • 添加了 WEBENCH 链接和 TI Designs 的顶部导航图标Go
  • Deleted lead temperature and related footnote from Abs Max table Go

Changes from Revision D (December 2014) to Revision E (November 2015)

  • Changed 14 V to 13 V in VCC Regulator section Go
  • Changed 8 to 4 on equation in Input Capacitor Go
  • Changed 0.17 μF to 0.34 μF in Input Capacitor section Go

Changes from Revision C (December 2013) to Revision D (November 2014)

  • 添加了引脚配置和功能 部分、ESD 等级 表、特性说明 部分、器件功能模式、应用和实施 部分、电源相关建议 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
  • 更改了典型应用 中的 VIN 电压Go
  • Changed max operating junction temperature in Recommended Operating Conditions table. Go
  • Changed Soft-Start Circuit graphicGo
  • Changed Frequency Selection section, Inductor Selection section, Output Capacitor section, Input Capacitor section, and UVLO Resistors sectionGo
  • Changed Series Ripple Resistor RC section to Type III Ripple Circuit Go

Changes from Revision B (December 2013) to Revision C (December 2013)

  • Added Thermal ParametersGo

Changes from Revision A (September 2013) to Revision B (December 2013)

  • 将文档中的格式更改为符合 TI 标准的格式Go
  • 将特性 中的最低输入电压从 9V 更改为 7.5VGo
  • 将典型应用 中的最低输入电压从 9V 更改为 7.5VGo
  • Changed minimum input voltage from 9 V to 7.5 V in Pin Descriptions Go
  • Added Absolute Maximum Junction TemperatureGo
  • Changed minimum input voltage from 9 V to 7.5 V in Recommended Operating Conditions Go

Changes from Revision * (December 2012) to Revision A (September 2013)

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