JAJSSX0B January   2022  – January 2024 TPS61376

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 VCC Power Supply
      2. 6.3.2 Enable and Programmable UVLO
      3. 6.3.3 Soft Start and Inrush Current Control During Start-Up
      4. 6.3.4 Switching Frequency
      5. 6.3.5 Adjustable input average Current Limit
      6. 6.3.6 Shut Down and Load Disconnect
      7. 6.3.7 Overvoltage Protection
      8. 6.3.8 Output Short Protection
      9. 6.3.9 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 PWM Mode
      2. 6.4.2 Auto PFM Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Setting Output Voltage
        2. 7.2.2.2 Inductor Selection
        3. 7.2.2.3 Bootstrap Capacitor Selection
        4. 7.2.2.4 Input Capacitor Selection
        5. 7.2.2.5 Output Capacitor Selection
        6. 7.2.2.6 Diode Selection
        7. 7.2.2.7 Loop Stability
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
        1. 7.4.2.1 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 サード・パーティ製品に関する免責事項
    2. 8.2 ドキュメントの更新通知を受け取る方法
    3. 8.3 サポート・リソース
    4. 8.4 Trademarks
    5. 8.5 静電気放電に関する注意事項
    6. 8.6 用語集
  10. 9 Revision History
  11. 10Mechanical, 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

6.4.2 Auto PFM Mode

The TPS61376 provides a seamless transition from PWM to PFM operation with smooth on-time/off-time (SOO) mode and enables automatic pulse-skipping mode that provides excellent efficiency over a wide load range. As load current decreasing or VIN rising, the output of the internal error amplifier decreases to lower the inductor peak current, delivering less power to the load. When the output of the error amplifier goes down and reaches a threshold of about 350-mA peak current, the output of the error amplifier is clamped at this value and does not decrease any more, the TPS61376 extends its off-time of the switching period to deliver less energy to the output and regulate the output voltage to the target.

With SOO mode, the TPS61376 keeps the output voltage equal to the setting voltage in PFM mode. In addition, the output voltage ripple is much smaller at light load due to low peak current. Refer to Figure 6-2.

GUID-20220606-SS0I-410M-6NLM-XCLR1FCLCS53-low.svg Figure 6-2 Auto PFM Mode Diagram