SLVSDG7A April   2016  – April 2021 TPS54202H

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and 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 Timing Requirements
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed-Frequency PWM Control
      2. 7.3.2  Pulse Skip Mode
      3. 7.3.3  Error Amplifier
      4. 7.3.4  Slope Compensation and Output Current
      5. 7.3.5  Device Enable
      6. 7.3.6  Adjusting Under Voltage Lockout
      7. 7.3.7  Safe Startup into Pre-Biased Outputs
      8. 7.3.8  Voltage Reference
      9. 7.3.9  Adjusting Output Voltage
      10. 7.3.10 Internal Soft-Start
      11. 7.3.11 Bootstrap Voltage (BOOT)
      12. 7.3.12 Overcurrent Protection
        1. 7.3.12.1 High-Side MOSFET Overcurrent Protection
        2. 7.3.12.2 Low-Side MOSFET Overcurrent Protection
      13. 7.3.13 Output Overvoltage Protection (OVP)
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Eco-mode Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 TPS54202H 8-V to 28-V Input, 5-V Output Converter
      2. 8.2.2 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Input Capacitor Selection
        2. 8.2.3.2 Bootstrap Capacitor Selection
        3. 8.2.3.3 Output Voltage Set Point
        4. 8.2.3.4 Enable Pin Setup
        5. 8.2.3.5 Output Filter Components
          1. 8.2.3.5.1 Inductor Selection
          2. 8.2.3.5.2 Output Capacitor Selection
          3. 8.2.3.5.3 Feed-Forward Capacitor
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.3.3 Output Voltage Set Point

The output voltage of the TPS54202H device is externally adjustable using a resistor divider network. In the application circuit of , this divider network is comprised of R2 and R3. Use Equation 6 and Equation 7 to calculate the relationship of the output voltage to the resistor divider.

Equation 6. GUID-86675DF1-625B-4297-B021-0A1BD21CD5DF-low.gif
Equation 7. GUID-245551B4-8A49-455F-89B2-50BA72C07F05-low.gif

Select a value of R2 to be approximately 100 kΩ. Slightly increasing or decreasing R3 can result in closer output voltage matching when using standard value resistors. In this design, R2 = 100 kΩ and R3 = 13.3 kΩ which results in a 5-V output voltage. The 49.9-Ω resistor, R1, is provided as a convenient location to break the control loop for stability testing.