JAJSM34F December   2012  – May 2021 LM25017

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  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 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 Applications
      1. 8.2.1 Application Circuit: 12.5-V to 48-V Input and 10-V, 650-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
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Typical Isolated DC-DC Converter Using LM25017
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1  Transformer Turns Ratio
          2. 8.2.2.2.2  Total IOUT
          3. 8.2.2.2.3  RFB1, RFB2
          4. 8.2.2.2.4  Frequency Selection
          5. 8.2.2.2.5  Transformer Selection
          6. 8.2.2.2.6  Primary Output Capacitor
          7. 8.2.2.2.7  Secondary Output Capacitor
          8. 8.2.2.2.8  Type III Feedback Ripple Circuit
          9. 8.2.2.2.9  Secondary Diode
          10. 8.2.2.2.10 VCC and Bootstrap Capacitor
          11. 8.2.2.2.11 Input Capacitor
          12. 8.2.2.2.12 UVLO Resistors
          13. 8.2.2.2.13 VCC Diode
        3. 8.2.2.3 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 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 サポート・リソース
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

4 Revision History

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

  • タイトルに「同期 Fly-Buck」を追加Go
  • アプリケーション の箇条書きにハイパーリンクを追加Go
  • 文書全体にわたって表、図、相互参照の採番方法を更新Go

Changes from Revision D (December 2014) to Revision E (November 2017)

  • WEBENCH へのリンクおよび TI Designs の上部ナビ・アイコンを追加Go
  • Deleted lead temperature and related footnote from Abs Max tableGo
  • Changed 14 V to 13 V in VCC Regulator sectionGo
  • Changed 8 to 4 on equation in Input Capacitor sectionGo
  • Changed 0.34 μF to 0.68 μF in Input Capacitor sectionGo

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

  • 「ピン構成および機能」セクション、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加Go
  • 「代表的なアプリケーション」の VIN 電圧を変更Go
  • Changed max operating junction temperature in Recommended Operating Conditions table. Go
  • Updated Thermal Information table with package designators. Go
  • Changed Soft-Start Circuit graphic.Go
  • Changed Frequency Selection section, Inductor Selection section, Output Capacitor section, Input Capacitor section, and UVLO Resistors sectionGo

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)

  • ドキュメント全体を通してフォーマットを TI 標準に変更Go
  • 「代表的なアプリケーション」の最小入力電圧を 9V から 7.5V に変更Go
  • Changed minimum input voltage from 9 V to 7.5 V in Pin Descriptions Go
  • Added 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) to Absolute Maximum Ratings Go