JAJSH98B April   2019  – October 2019 TPS61390

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション回路
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Recommended Operating Conditions
    2. 6.2 Absolute Maximum Ratings
    3. 6.3 ESD Ratings
    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 Undervoltage Lockout
      2. 7.3.2 Enable and Disable
      3. 7.3.3 Current Mirror
      4. 7.3.4 Sample and Hold
      5. 7.3.5 High Optical Power Protection
    4. 7.4 Device Functional Mode
      1. 7.4.1 PFM Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirement
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Selecting the Rectifier Diode
        2. 8.2.2.2  Selecting the Inductor
        3. 8.2.2.3  Selecting Output Capacitor
        4. 8.2.2.4  Selecting Filter Resistor and Capacitor
        5. 8.2.2.5  Setting the Output Voltage
        6. 8.2.2.6  Selecting Sample Window
        7. 8.2.2.7  Selecting Capacitor for CAP pin
        8. 8.2.2.8  Selecting Capacitor for AVCC pin
        9. 8.2.2.9  Selecting Capacitor for APD pin
        10. 8.2.2.10 Selecting the Resistors of MON1 or MON2
        11. 8.2.2.11 Selecting the Capacitors of MON1 or MON2
        12. 8.2.2.12 Selecting the Resistor of Gain pin
        13. 8.2.2.13 Selecting the Short Current Limit
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 ドキュメントの更新通知を受け取る方法
    2. 11.2 コミュニティ・リソース
    3. 11.3 商標
    4. 11.4 静電気放電に関する注意事項
    5. 11.5 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

7.4.1 PFM Operation

The TPS61390 integrates a power save mode with pulse frequency modulation (PFM) at the light load. When a light load condition occurs, the COMP pin voltage naturally decreases and reduces the peak current. When the COMP pin voltage further goes down with the load lowered and reaches the pre-set low threshold, the output of the error amplifier is clamped at this threshold and does not go down any more. If the load is further lowered, the device skips the switching cycles and reduces the switching losses and improves efficiency at the light load condition by reducing the average switching frequency.