SLUUCL5A december   2022  – may 2023 TPS564252 , TPS564255 , TPS564257

 

  1.   Description
  2.   Features
  3.   Applications
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Performance Specification Summary
  7. 3Output Voltage Setpoint
  8. 4Test Setup and Results
    1. 4.1 Input, Output Connections
    2. 4.2 Start-Up Procedure
    3. 4.3 Efficiency
    4. 4.4 Load Regulation
    5. 4.5 Line Regulation
    6. 4.6 Load Transient Response
    7. 4.7 Start-Up
    8. 4.8 Shutdown
    9. 4.9 Output Voltage Ripple
  9. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  10. 6Additional Information
    1.     Trademarks
  11. 7Reference
  12. 8Revision History

3 Output Voltage Setpoint

The output voltage of the EVM can be selected by changing the value of resistor R4 (RUPPER) and R5 (RLOWER). The value of R4 for a specific output voltage can be calculated using Equation 1. The output voltage is set with a resistor divider from the output node to the FB pin. TI recommends using 1% tolerance or better divider resistors. Start with a 10 kΩ or 30 kΩ for R4 (RFBB) and use Equation 1 to calculate R5 (RFBT) . To improve efficiency at light loads, consider using larger value resistors. If the values are too high, the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable.

Equation 1. V OUT = 0 . 6 × 1 + R 4 R 5