JAJSBF8B June   2011  – April 2018 TPS54478

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     効率
  4. 4 改訂履歴
  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 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  Fixed Frequency PWM Control
      2. 7.3.2  Slope Compensation and Output Current
      3. 7.3.3  Bootstrap Voltage (BOOT) and Low Dropout Operation
      4. 7.3.4  Error Amplifier
      5. 7.3.5  Voltage Reference
      6. 7.3.6  Adjusting the Output Voltage
      7. 7.3.7  Enable and Adjusting Undervoltage Lockout
      8. 7.3.8  Slow Start / Tracking Pin
      9. 7.3.9  Constant Switching Frequency and Timing Resistor (RT/CLK Pin)
      10. 7.3.10 Overcurrent Protection
      11. 7.3.11 START-UP into Prebiased Output
      12. 7.3.12 Synchronize Using the RT/CLK Pin
      13. 7.3.13 Power Good (PWRGD Pin)
      14. 7.3.14 Overvoltage Transient Protection
      15. 7.3.15 Thermal Shutdown
      16. 7.3.16 Small Signal Model for Loop Response
      17. 7.3.17 Simple Small Signal Model for Peak Current Mode Control
      18. 7.3.18 Small Signal Model for Frequency Compensation
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Operation
      2. 7.4.2 Standby Operation
    5. 7.5 Programming
      1. 7.5.1 Sequencing
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Selecting the Switching Frequency
        2. 8.2.2.2 Output Inductor Selection
        3. 8.2.2.3 Output Capacitor
        4. 8.2.2.4 Input Capacitor
        5. 8.2.2.5 Slow Start Capacitor
        6. 8.2.2.6 Bootstrap Capacitor Selection
        7. 8.2.2.7 Output Voltage and Feedback Resistors Selection
        8. 8.2.2.8 Compensation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation Estimate
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 11.1.2 WEBENCH®ツールによるカスタム設計
    2. 11.2 ドキュメントのサポート
      1. 11.2.1 関連資料
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 コミュニティ・リソース
    5. 11.5 商標
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 Glossary
  12. 12メカニカル、パッケージ、および注文情報

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

6.6 Typical Characteristics

TPS54478 shutdwn_tj_lvsas2.gifFigure 1. Shutdown Supply Current vs Temperature
TPS54478 thresh_tj_lvsas2.gifFigure 3. EN Pin Voltage vs Temperature
TPS54478 vref_tj_lvsas2.gifFigure 5. Voltage Reference vs Temperature
TPS54478 AE_tj_lvsas2.gifFigure 7. Transconductance vs Temperature
TPS54478 fs_RT_lvsas2.gifFigure 9. Switching Frequency vs RT Resistance
TPS54478 vss_tj_lvsas2.gifFigure 11. VSS Voltage Threshold VSSTHR vs Temperature
TPS54478 Iss2_tj_lvsas2.gifFigure 13. SS Charge Current vs Temperature
TPS54478 PWRGD_tj_lvsas2.gifFigure 15. PWRGD Threshold vs Temperature
TPS54478 eff1a_io_lvsas2.gifFigure 17. Efficiency vs Load Current
TPS54478 eff3a_io_lvsas2.gifFigure 19. Efficiency vs Load Current
TPS54478 Ivin_tj_lvsas2.gifFigure 2. VIN Supply Current vs Temperature
TPS54478 EN_pin_tj_lvsas2.gifFigure 4. EN Pin Current vs Temperature
TPS54478 radson_tj_lvsas2.gifFigure 6. MOSFET Rdson vs Temperature
TPS54478 HSFET_tj_lvsas2.gifFigure 8. High Side FET Current Limit vs Temperature
TPS54478 fs_tj_lvsas2.gifFigure 10. Switching Frequency vs Temperature
TPS54478 Iss1_tj_lvsas2.gifFigure 12. SS Charge Current vs Temperature
TPS54478 radson2_tj_lvsas2.gifFigure 14. PWRGD Rdson vs Temperature
TPS54478 PWRGD2_tj_lvsas2.gifFigure 16. PWRGD Leakage Current vs Temperature
TPS54478 eff2a_io_lvsas2.gifFigure 18. Efficiency vs Load Current
TPS54478 eff4a_io_lvsas2.gifFigure 20. Efficiency vs Load Current