SLVSAG7F November   2011  – November 2021 TPS62130 , TPS62130A , TPS62131 , TPS62132 , TPS62133

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings (1)
    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 Programming The Output Voltage
        2. 9.2.2.2 External Component Selection
          1. 9.2.2.2.1 Inductor Selection
          2. 9.2.2.2.2 Capacitor Selection
            1. 9.2.2.2.2.1 Output Capacitor
            2. 9.2.2.2.2.2 Input Capacitor
            3. 9.2.2.2.2.3 Soft-Start Capacitor
        3. 9.2.2.3 Tracking Function
        4. 9.2.2.4 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 –3.3-V 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 Information
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
9.2.2.2.1 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.

Equation 7. GUID-9A8BEC90-932E-4019-BD1C-E0101B7331AE-low.gif
Equation 8. GUID-2FC7D48A-5FFD-4E2B-8D7F-3CADD16C691A-low.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.

Calculating the maximum inductor current using the actual operating conditions gives the required minimum saturation current of the inductor. It is recommended to add a margin of approximately 20%. 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 TPS6213x and are recommended for use:

Table 9-3 List Of Inductors
TYPE INDUCTANCE [µH] CURRENT [A](1) DIMENSIONS [L × B × H] 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.

The inductor value also determines the load current at which power save mode is entered:

Equation 9. GUID-4A535C30-3C3C-471A-9805-3E1766955FA3-low.gif

Using Equation 9, this current level can be adjusted by changing the inductor value.