JAJS528B December   2010  – November 2023 TPS53315

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  D-CAP™ Integrated Circuit with Adaptive On-Time
      2. 6.3.2  Small Signal Model
      3. 6.3.3  Ramp Signal
      4. 6.3.4  Auto-Skip Eco-mode Light Load Operation
      5. 6.3.5  Adaptive Zero Crossing
      6. 6.3.6  Forced Continuous Conduction Mode
      7. 6.3.7  Power Good
      8. 6.3.8  Current Sense and Overcurrent Protection
      9. 6.3.9  Overvoltage and Undervoltage Protection
      10. 6.3.10 UVLO Protection
      11. 6.3.11 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 Enable and Soft Start
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Typical Application Circuit Diagram
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Step 1: Select Operation Mode and Soft-Start Time
          2. 7.2.1.2.2 Step 2: Select Switching Frequency
          3. 7.2.1.2.3 Step 3: Select the Inductance
          4. 7.2.1.2.4 Step 4: Select Output Capacitors
          5. 7.2.1.2.5 Step 5: Determine the Voltage-Divider Resistance (R1 and R2)
          6. 7.2.1.2.6 Step 6: Select the Overcurrent Resistance (RTRIP)
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Typical Application Circuit Diagram With Ceramic Output Capacitors
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
          1. 7.2.2.2.1 Step 1: Select Operation Mode and Soft-Start Time
          2. 7.2.2.2.2 Step 2: Select Switching Frequency
          3. 7.2.2.2.3 Step 3: Select the Inductance
          4. 7.2.2.2.4 Step 4: Select Output Capacitance for Ceramic Capacitors
          5. 7.2.2.2.5 Step 5: Select the Overcurrent Setting Resistance (RTRIP)
        3. 7.2.2.3 External Component Selection When Using All Ceramic Output Capacitors
        4. 7.2.2.4 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 ドキュメントの更新通知を受け取る方法
    2. 8.2 サポート・リソース
    3. 8.3 Trademarks
    4. 8.4 静電気放電に関する注意事項
    5. 8.5 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
7.2.1.2.3 Step 3: Select the Inductance

The inductance value must be determined to give the ripple current of approximately 1/4 to 1/2 of maximum output current. Larger ripple current increases output ripple voltage and improves signal-to-noise ratio and helps make sure of stable operation, but increases inductor core loss. Using 1/3 ripple current to maximum output current ratio, the inductance can be determined by Equation 6.

The inductor requires a low DCR to achieve good efficiency. It also requires enough room above peak inductor current before saturation. The peak inductor current can be estimated in Equation 7.

Equation 6. GUID-7E551C0E-A525-41CF-B36F-C28CF71C78D4-low.gif
Equation 7. GUID-E9023FF9-9F1D-4F6B-B05A-22C8F576CC37-low.gif