SLUUCQ4A february   2023  – august 2023 TPS563203 , TPS563206

 

  1.   1
  2.   Trademarks
  3. 1Introduction
  4. 2Performance Specification Summary
  5. 3Output Voltage Setpoint
  6. 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
  7. 5Board Layout
    1. 5.1 Layout
  8. 6Schematic, List of Materials, and Reference
    1. 6.1 Schematic
    2. 6.2 Bill 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 (RUPPER) and R6 (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 R6 (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. V OUT = 0 . 6 × 1 + R 4 R 6