SLVSB74H February   2012  – June 2018 TLV62130 , TLV62130A

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Schematic
      2.      Efficiency vs Output Current
  4. 4 Revision History
  5. 5 Device Comparison Table
  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 Enable / Shutdown (EN)
      2. 8.3.2 Soft Start / Tracking (SS/TR)
      3. 8.3.3 Power Good (PG)
      4. 8.3.4 Pin-Selectable Output Voltage (DEF)
      5. 8.3.5 Frequency Selection (FSW)
      6. 8.3.6 Undervoltage Lockout (UVLO)
      7. 8.3.7 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Pulse Width Modulation (PWM) Operation
      2. 8.4.2 Power Save Mode Operation
      3. 8.4.3 100% Duty-Cycle Operation
      4. 8.4.4 Current Limit and Short Circuit Protection
  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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Programming the Output Voltage
        3. 9.2.2.3 External Component Selection
          1. 9.2.2.3.1 Inductor Selection
          2. 9.2.2.3.2 Capacitor Selection
            1. 9.2.2.3.2.1 Output Capacitor
            2. 9.2.2.3.2.2 Input Capacitor
            3. 9.2.2.3.2.3 Soft Start Capacitor
        4. 9.2.2.4 Tracking Function
        5. 9.2.2.5 Output Filter and Loop Stability
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 LED Power Supply
      2. 9.3.2 Active Output Discharge
      3. 9.3.3 Inverting Power Supply
      4. 9.3.4 Various Output Voltages
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
      2. 12.1.2 Development Support
        1. 12.1.2.1 Custom Design With WEBENCH® Tools
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Documentation Support
      1. 12.3.1 Related Documentation
    4. 12.4 Related Links
    5. 12.5 Community Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

9.2.2.3.1 Inductor Selection

The inductor selection is affected by several effects like inductor ripple current, output ripple voltage, PWM-to-PSM transition point and efficiency. In addition, the inductor selected has to be rated for appropriate saturation current and DC resistance (DCR). Equation 7 and Equation 8 calculate the maximum inductor current under static load conditions.

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Equation 7. TLV62130 TLV62130A SLVSAG7_eqilmax.gif
Equation 8. TLV62130 TLV62130A SLVSAG7_eqiripple.gif

where

  • IL(max) is the maximum inductor current.
  • ΔIL is the Peak to Peak Inductor Ripple Current.
  • L(min) is the minimum effective inductor value.
  • fSW is the actual PWM Switching Frequency.

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Calculating the maximum inductor current using the actual operating conditions gives the minimum saturation current of the inductor needed. A margin of about 20% is recommended to add. A larger inductor value is also useful to get lower ripple current, but increases the transient response time and size as well. The following inductors have been used with the TLV62130 and are recommended for use:

Table 5. List of Inductors

Type Inductance [µH] Current [A](1) Dimensions [LxBxH] mm MANUFACTURER(2)
XFL4020-102ME_ 1.0 µH, ±20% 4.7 4 × 4 × 2.1 Coilcraft
XFL4020-152ME_ 1.5 µH, ±20% 4.2 4 × 4 × 2.1 Coilcraft
XFL4020-222ME_ 2.2 µH, ±20% 3.8 4 × 4 × 2.1 Coilcraft
IHLP1212BZ-11 1.0 µH, ±20% 4.5 3 × 3.6 × 2 Vishay
IHLP1212BZ-11 2.2 µH, ±20% 3.0 3 × 3.6 × 2 Vishay
SRP4020-3R3M 3.3µH, ±20% 3.3 4.8 × 4 × 2 Bourns
VLC5045T-3R3N 3.3µH, ±30% 4.0 5 × 5 × 4.5 TDK
(1) Lower of IRMS at 40°C rise or ISAT at 30% drop.
(2) See Third-Party Products Disclaimer

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The inductor value also determines the load current at which Power Save Mode is entered:

Equation 9. TLV62130 TLV62130A SLVSAG7_eqipsm.gif

Using Equation 8, this current level can be adjusted by changing the inductor value.