SNVU759 July   2021 TPS548B27

 

  1.   Trademarks
  2. 1Introduction
  3. 2Safety Warnings
  4. 3Background
  5. 4Performance Specification Summary
  6. 5Modifications
    1. 5.1 Output Voltage Setpoint
    2. 5.2 Frequency and Operation Mode Setting
    3. 5.3 Enable Pin Selection
    4. 5.4 Remote Sensing
    5. 5.5 Adjustable UVLO
  7. 6Schematic
  8. 7List of Materials
  9. 8Layout

5.1 Output Voltage Setpoint

To change the output voltage of the EVM, it is necessary to change the value of resistor R8 and R9. R13 is fixed at 10 kΩ. Changing the total value of R8 plus R9 can change the output voltage above the 0.6-V reference voltage VINTREF. A two resistor configuration of R8 + R9 is implemented to give the exact desired output voltage setting. The value of R8 and R9 for a specific output voltage can be calculated using Equation 1.

Equation 1. GUID-AE61B014-1FD6-410B-8402-CFFD8883521C-low.gif

where

  • VINTREF = 0.6 V
  • RFB_HS = R8+ R9
  • RFB_LS = R13 = 10 kΩ