SLVSE31C January   2018  – July 2018 TPSM84209

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application
      2.      Efficiency vs Output Current
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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 (VIN = 5 V)
    7. 6.7 Typical Characteristics (VIN = 12 V)
    8. 6.8 Typical Characteristics (VIN = 24 V)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Input Capacitor Selection
      3. 7.3.3  Undervoltage Lockout (UVLO)
      4. 7.3.4  Output Capacitor Selection
      5. 7.3.5  Feed-Forward Capacitor
      6. 7.3.6  Operating Range
      7. 7.3.7  Output Current Rating
      8. 7.3.8  Enable (EN)
      9. 7.3.9  Internal Soft Start
      10. 7.3.10 Safe Start-Up Into Prebiased Outputs
      11. 7.3.11 Light Load Efficiency / Eco-Mode
      12. 7.3.12 Voltage Dropout
      13. 7.3.13 Overcurrent Protection
      14. 7.3.14 Output Overvoltage Protection (OVP)
      15. 7.3.15 Thermal Performance
      16. 7.3.16 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Eco-Mode Operation
      3. 7.4.3 Shutdown Mode
  8. 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 Output Voltage Setpoint
        3. 8.2.2.3 Input Capacitors
        4. 8.2.2.4 Output Capacitors
        5. 8.2.2.5 Enable Control
      3. 8.2.3 Application Waveforms
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 EMI
      1. 10.3.1 EMI Plots
    4. 10.4 Package Specifications
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Custom Design With WEBENCH® Tools
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

7.3.1 Adjusting the Output Voltage

A resistor divider connected to the FB pin (pin 1) programs the output voltage of the TPSM84209. The output voltage adjustment range is from 1.2 V to 6 V. Figure 17 shows the feedback resistor connection for setting the output voltage. The recommended value of RFBT is 10 kΩ. Table 1 lists the closest standard E96 value for the RFBB resistor for a number of common output voltages. For other output voltages, the value of the required RFFB resistor can be calculated using Equation 1.

Equation 1. TPSM84209 SDRfbbEq.gif
TPSM84209 FBresistorDivNoCFF.gifFigure 17. Setting the Output Voltage

Table 1. Standard RFBB Resistor Values

VOUT (V) RFBB (kΩ) VOUT (V) RFBB (kΩ)
1.2 10.0 3.7 1.96
1.3 8.45 3.8 1.87
1.4 7.50 3.9 1.82
1.5 6.65 4.0 1.74
1.6 6.04 4.1 1.69
1.7 5.36 4.2 1.65
1.8 4.99 4.3 1.62
1.9 4.64 4.4 1.58
2.0 4.22 4.5 1.54
2.1 4.02 4.6 1.50
2.2 3.74 4.7 1.47
2.3 3.48 4.8 1.43
2.4 3.32 4.9 1.40
2.5 3.16 5.0 1.37
2.6 3.01 5.1 1.33
2.7 2.87 5.2 1.30
2.8 2.74 5.3 1.27
2.9 2.61 5.4 1.24
3.0 2.49 5.5 1.22
3.1 2.37 5.6 1.20
3.2 2.32 5.7 1.18
3.3 2.21 5.8 1.15
3.4 2.15 5.9 1.13
3.5 2.05 6.0 1.10
3.6 2.00