JAJSF35D September   2017  – October 2019 TPS50601A-SP

PRODUCTION DATA.  

  1. 1 特長
    1.     VIN＝PVIN＝5Vでの効率
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  VIN and Power VIN Pins (VIN and PVIN)
      2. 8.3.2  Voltage Reference
      3. 8.3.3  Adjusting the Output Voltage
      4. 8.3.4  Safe Start-Up Into Prebiased Outputs
      5. 8.3.5  Error Amplifier
      6. 8.3.6  Slope Compensation
      7. 8.3.7  Enable and Adjust UVLO
      8. 8.3.8  Adjustable Switching Frequency and Synchronization (SYNC)
      9. 8.3.9  Slow Start (SS/TR)
      10. 8.3.10 Power Good (PWRGD)
      11. 8.3.11 Sequencing (SS/TR)
      12. 8.3.12 Output Overvoltage Protection (OVP)
      13. 8.3.13 Overcurrent Protection
        1. 8.3.13.1 High-Side MOSFET Overcurrent Protection
        2. 8.3.13.2 Low-Side MOSFET Overcurrent Protection
      14. 8.3.14 Thermal Shutdown
      15. 8.3.15 Turn-On Behavior
      16. 8.3.16 Small Signal Model for Frequency Compensation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Fixed-Frequency PWM Control
      2. 8.4.2 Continuous Current Mode (CCM) Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Operating Frequency
        2. 9.2.2.2 Output Inductor Selection
        3. 9.2.2.3 Output Capacitor Selection
        4. 9.2.2.4 Slow Start Capacitor Selection
        5. 9.2.2.5 Undervoltage Lockout (UVLO) Set Point
        6. 9.2.2.6 Output Voltage Feedback Resistor Selection
        7. 9.2.2.7 Compensation Component Selection
      3. 9.2.3 Parallel Operation
      4. 9.2.4 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 コミュニティ・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13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

9.2.2.2 Output Inductor Selection

To calculate the value of the output inductor, use Equation 13. KL is a coefficient that represents the amount of inductor ripple current relative to the maximum output current, IO. The inductor ripple current is filtered by the output capacitor therefore, choosing high inductor ripple currents impact the selection of the output capacitor since the output capacitor must have a ripple current rating equal to or greater than the inductor ripple current. In general, the inductor ripple value is at the discretion of the designer depending on specific system needs. Typical values for KL range from 0.1 to 0.5. For low output currents, the value of KL could be increased to reduce the value of the output inductor.

Equation 13. TPS50601A-SP eq_inductor.gif

For this design example, use KL = 0.45 and the inductor value is calculated to be 4.7 µH for nominal VIN = 5 V.