JAJSF46I March   2018  – March 2024 TPS62824 , TPS62824A , TPS62825 , TPS62825A , TPS62826 , TPS62826A , TPS62827 , TPS62827A

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Device Options
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pulse Width Modulation (PWM) Operation
      2. 7.3.2 Power Save Mode (PSM) Operation
      3. 7.3.3 Minimum Duty Cycle and 100% Mode Operation
      4. 7.3.4 Soft Start
      5. 7.3.5 Switch Current Limit and HICCUP Short-Circuit Protection
      6. 7.3.6 Undervoltage Lockout
      7. 7.3.7 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Enable, Disable, and Output Discharge
      2. 7.4.2 Power Good
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Setting The Output Voltage
        3. 8.2.2.3 Output Filter Design
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Capacitor Selection
      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
        1. 8.4.2.1 Thermal Considerations
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 サード・パーティ製品に関する免責事項
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 サポート・リソース
    4. 9.4 Trademarks
    5. 9.5 静電気放電に関する注意事項
    6. 9.6 用語集
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.2.4 Inductor Selection

The main parameter for the inductor selection is the inductor value and then the saturation current of the inductor. To calculate the maximum inductor current under static load conditions, Equation 6 is given.

Equation 6. I L , M A X = I O U T , M A X + ∆ I L 2
∆ I L = V O U T × 1 - V O U T V I N L × f S W

where

  • IOUT,MAX = Maximum output current
  • ΔIL = Inductor current ripple
  • fSW = Switching frequency
  • L = Inductor value

TI recommends to choose a saturation current for the inductor that is approximately 20% to 30% higher than IL,MAX. In addition, DC resistance and size must also be taken into account when selecting an appropriate inductor. Table 8-5 lists recommended inductors.

Table 8-5 List of Recommended Inductors
INDUCTANCE [µH] CURRENT RATING [A] DIMENSIONS [L × W × H mm] MAX. DC RESISTANCE [mΩ] MFR PART NUMBER(1)
0.47 4.8 2.0 × 1.6 × 1.0 32 HTEN20161T-R47MDR, Cyntec
4.6 2.0 × 1.2 × 1.0 25 HTEH20121T-R47MSR, Cyntec
4.8 2.0 × 1.6 × 1.0 32 DFE201610E - R47M, MuRata
4.8 2.0 × 1.6 × 1.0 32 DFE201210S - R47M, MuRata
5.1 2.0 × 1.6 × 1.0 34 TFM201610ALM-R47MTAA, TDK
5.2 2.0 × 1.6 × 1.0 25 TFM201610ALC-R47MTAA, TDK
6.6 4.0 × 4.0 × 1.6 8.36 XFL4015-471ME, Coilcraft
8.0 3.5 × 3.2 × 2.0 10.85 XEL3520-471ME, Coilcraft
6.8 4.5 × 4 × 1.8 11.2 WE-LHMI-744373240047, Würth