SLVUBM5A April   2019  – August 2021 TPS54A24

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Characteristics Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Setpoint
      2. 1.3.2 Adjustable UVLO
      3. 1.3.3 Component Values to Evaluate Common Output Voltages
  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  Load Transient and Loop Response
    5. 2.5  Output Voltage Ripple
    6. 2.6  Input Voltage Ripple
    7. 2.7  Powering Up
    8. 2.8  Powering Down
    9. 2.9  Start-Up Into Pre-Bias
    10. 2.10 Hiccup Mode Current Limit
    11. 2.11 Thermal Performance
  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

1.3.3 Component Values to Evaluate Common Output Voltages

Table 1-3 shows recommended modifications to the EVM for evaluating other common output voltages. These recommended component values were selected to keep the output capacitors at the default EVM components to minimize the number of changes. Depending on the load step response requirements in the application, the output capacitors may need to be different from the default EVM components. More or less output capacitance may be used. If the output capacitors are changed, the compensation may also need to be adjusted. Additionally if the fSW is changed, the inductance value (L) may also need to be changed. The TPS54A24 datasheet equations or WEBENCH can be used to calculate the output capacitor value, compensation, fSW and inductance. Ensure all components have sufficient voltage and current ratings.

Table 1-3 Component Values to Evaluate Common Output Voltages
VOUT (V)fSW (kHz)RT (R7) (kΩ)L (µH)COUT (µF)RFBT (R8) (kΩ)RC (R5) (kΩ)CC (C18) (nF)CP (C17) (pF)CFF (C19) (pF)
15001000.683x 1004.026.654.782330
1.25001000.823x 1006.046.654.782220
3.35001001.83x 10027.412.12.73947
55001002.23x 10044.212.12.73933