SLVSB71E February   2012  – September 2016 TLV62150 , TLV62150A

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 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 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. 12.2 Related Links
    3. 12.3 Documentation Support
      1. 12.3.1 Related Documentation
    4. 12.4 Receiving Notification of Documentation Updates
    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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
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.

spacing

Equation 7. TLV62150 TLV62150A SLVSAG7_eqilmax.gif
Equation 8. TLV62150 TLV62150A 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 TLV62150 and are recommended for use:

Table 5. List of Inductors

Type Inductance [µH] Saturation Current [A](1) Dimensions [L x B x H] mm MANUFACTURER(2)
XFL4020-222ME_ 2.2 µH, ±20% 3.5 4 × 4 × 2.1 Coilcraft
XFL3012-222MEC 2.2 µH, ±20% 1.6 3 × 3 × 1.2 Coilcraft
XFL3012-332MEC 3.3 µH, ±20% 1.4 3 × 3 × 1.2 Coilcraft
VLS252012T-2R2M1R3 2.2 µH, ±20% 1.3 2.5 × 2 × 1.2 TDK
LPS3015-332 3.3 µH, ±20% 1.4 3 × 3 × 1.4 Coilcraft
744025003 3.3 µH, ±20% 1.5 2.8 × 2.8 × 2.8 Wuerth
PSI25201B-2R2MS 2.2 µH, ±20% 1.3 2 × 2.5 × 1.2 Cyntec
NR3015T-2R2M 2.2 µH, ±20% 1.5 3 × 3 × 1.5 Taiyo Yuden
(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. TLV62150 TLV62150A SLVSAG7_eqipsm.gif

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