SLVSEF9H march   2018  – august 2023

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Options
  7. 6 Pin Configuration and Functions
  8. 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
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Pulse Width Modulation (PWM) Operation
      2. 8.3.2 Power Save Mode (PSM) Operation
      3. 8.3.3 Minimum Duty Cycle and 100% Mode Operation
      4. 8.3.4 Soft Start
      5. 8.3.5 Switch Current Limit and HICCUP Short-Circuit Protection
      6. 8.3.6 Undervoltage Lockout
      7. 8.3.7 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Enable, Disable, and Output Discharge
      2. 8.4.2 Power Good
  10. 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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Setting The Output Voltage
        3. 9.2.2.3 Output Filter Design
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Capacitor Selection
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
        1. 9.4.2.1 Thermal Considerations
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Development Support
        1. 10.1.2.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

9.2.2.4 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 9-5 lists recommended inductors.

Table 9-5 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
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