SLUUCL4A August   2022  – March 2023 TPS563252 , TPS563257

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Performance Specification Summary
  5. 3Output Voltage Setpoint
  6. 4Test Setup and Results
    1. 4.1 Input and 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
  7. 5Board Layout
    1. 5.1 Layout
  8. 6Schematic, List of Materials, and Reference
    1. 6.1 Schematic
    2. 6.2 List of Materials
    3. 6.3 Reference
  9. 7Revision History

3 Output Voltage Setpoint

The output voltage of the EVM can be selected by changing the value of resistor R4 (RFBT) and R5 (RFBB). TI recommends using 1% tolerance or better divider resistors. Start with a 10 kΩ for R5 (RFBB) and use Equation 1 to calculate R4 (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. R4 = R5 × Vout - 0.6 V0.6 V