SLVUAP3A April   2016  – October 2021 TPS54202

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Set Point
      2. 1.3.2 Output Capacitor and Feed-Forward Capacitor
      3. 1.3.3 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 Output Voltage Ripple
    7. 2.7 Input Voltage Ripple
    8. 2.8 Powering Up
    9. 2.9 Powering Down
  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

1.3.1 Output Voltage Set Point

The voltage divider, R2 and R3, is used to set the output voltage. To change the output voltage of the EVM, it is necessary to change the value of resistor R3. Changing the value of R3 can change the output voltage above 0.596 V. The value of R3 for a specific output voltage can be calculated using Equation 1. Use 100 kΩ for R2.

Equation 1. GUID-958D3C34-91FC-43EF-ADF8-9855C53B2126-low.gif

Table 1-3 lists the R2 and R3 values for some common output voltages. Note that VIN must be in a range so that the minimum on-time is greater than 150 ns. The values in Table 1-3 are standard values, not the exact value calculated using Equation 1.

Table 1-3 Recommended Component Values
VOUT (V)L (µH)COUT (µF)R2 (kΩ)R3 (kΩ)C8 (pF)
1.85.66610049.947
2.58.24410031.633
3.3104410022.156
5154410013.375
1222441005.23100