SLVUAM8B December   2015  – August 2021 TPS54A20

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Before You Begin
    2. 1.2 Background
    3. 1.3 Performance Specification Summary
    4. 1.4 Modifications
      1. 1.4.1 Output Voltage Setpoint
      2. 1.4.2 On Time
      3. 1.4.3 Adjustable UVLO
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Output Voltage Load Regulation
    4. 2.4  Output Voltage Line Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristics
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Powering Up
    10. 2.10 Thermal Image
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
  6. 5Revision History

1.4.1 Output Voltage Setpoint

The output voltage is set by the resistor divider network of R9 (R(TOP)) and R7 (R(BOT)). R7 is fixed at 14.3 kΩ. To change the output voltage of the EVM, it is necessary to change the value of resistor R9. Changing the value of R9 can change the output voltage above the 0.508 V reference voltage VREF. The value of R9 for a specific output voltage can be calculated using Equation 1.

Equation 1. GUID-3C7DCEAE-E78D-4EB5-A9CE-ADC2C83A5B43-low.gif