JAJST73E April   2009  – April 2024 TPS22960

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 Switching Characteristics
    7. 5.7 Typical DC Characteristics
    8. 5.8 Typical Switching Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Output Slew Rate (SR) Control
      2. 7.3.2 Quick Output Discharge (QOD)
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 ON/OFF Control
      2. 8.1.2 Input Capacitor
      3. 8.1.3 Output Capacitor
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Inrush Current
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 ドキュメントの更新通知を受け取る方法
    2. 9.2 サポート・リソース
    3. 9.3 Trademarks
    4. 9.4 静電気放電に関する注意事項
    5. 9.5 用語集
  11. 10Revision History
  12. 11Mechanical, 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

8.2.2.1 Inrush Current

When the switch is enabled, the output capacitors must be charged up from 0 V to the set value (in this example, 3.3 V). This charge arrives in the form of inrush current. Inrush current can be calculated using the following equation:

Equation 1. Inrush Current = C × dV / dt

Where:

C = output capacitance

dV = output voltage

dt = rise time

The TPS22960 offers selectable rise time control for VOUT. This feature allows the user to control the inrush current during turnon. Equation 1 can be used to find the required rise time to limit the inrush current to the design requirements

Equation 2. 200 mA = 22 µF × (3.3 V × 80%) / dt

dt = 290 µs (4)

To ensure an inrush current of less than 200 mA, SR must be set high for a rise time greater than 290 µs. The following application curves show the different inrush for each SR setting in this design example.