JAJSCZ3A March   2017  – February 2018 LM25141-Q1

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin 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
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  High Voltage Start-Up Regulator
      2. 8.3.2  VCC Regulator
      3. 8.3.3  Oscillator
      4. 8.3.4  Synchronization
      5. 8.3.5  Frequency Dithering (Spread Spectrum)
      6. 8.3.6  Enable
      7. 8.3.7  Power Good
      8. 8.3.8  Output Voltage
        1. 8.3.8.1 Minimum Output Voltage Adjustment
      9. 8.3.9  Current Sense
      10. 8.3.10 DCR Current Sensing
      11. 8.3.11 Error Amplifier and PWM Comparator
      12. 8.3.12 Slope Compensation
      13. 8.3.13 Hiccup Mode Current Limiting
      14. 8.3.14 Standby Mode
      15. 8.3.15 Soft Start
      16. 8.3.16 Diode Emulation
      17. 8.3.17 High- and Low-Side Drivers
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Inductor Calculation
        3. 9.2.2.3 Current Sense Resistor
        4. 9.2.2.4 Output Capacitor
        5. 9.2.2.5 Input Filter
          1. 9.2.2.5.1 EMI Filter Design
          2. 9.2.2.5.2 MOSFET Selection
          3. 9.2.2.5.3 Driver Slew Rate Control
          4. 9.2.2.5.4 Frequency Dithering
        6. 9.2.2.6 Control Loop
          1. 9.2.2.6.1 Feedback Compensator
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Layout Procedure
    2. 11.2 Layout Examples
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 開発サポート
        1. 12.1.1.1 WEBENCH®ツールによるカスタム設計
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連資料
        1. 12.2.1.1 PCBレイアウトについてのリソース
        2. 12.2.1.2 熱設計についてのリソース
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報

9.1 Application Information

The LM25141-Q1 is a synchronous buck controller used to convert a higher input voltage to a lower output voltage. The following design procedure can be used to select external component values. Alternately, the WEBENCH®software may be used to generate a complete design. The WEBENCH software uses an iterative design procedure and accesses a comprehensive database of components when generating a design. This section presents a simplified design process. In addition to the WEBENCH software, the user should avail of the LM25141-Q1 quick-start calculator.

LM25141-Q1 TIDesignsLogo.png
For step-by-step design procedure, circuit schematics, bill of materials, PCB files, simulation and test results of an LM25141-Q1-powered implementation, see TI Designs reference design library.