SLVUCU8 January   2024

 

  1.   1
  2.    TPS54KC23EVM 30-A, Regulator Evaluation Module
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  5. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Frequency and Operation Mode Setting (MSEL Pin)
  6. 3Test Setup and Results
    1. 3.1 Input/Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Output Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 Thermal Performance
  7. 4Board Layout
    1. 4.1 Layout
  8. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.4 Load Transient and Loop Response

Figure 3-10 and Figure 3-11 show the response to load transients for both designs. The current step is from 5 A to 20 A and the current step slew rate is 1 A/µs. An electronic load is used to provide a DC 5-A load and the load transient circuit on the EVM is used to provide a 15-A step. The VOUT voltage is measured using TP11 for U1 and TP29 for U2.

Figure 3-12 and Figure 3-13 show the loop characteristics for both designs. Gain and phase plots are shown for VIN voltage of 12 V and a 15-A load.

GUID-20240110-SS0I-FB7X-4J8X-RRPKF2LSH4JP-low.pngFigure 3-10 U1 Transient Response
GUID-20240109-SS0I-JMKX-JN7N-DKRQJRZ78ZN2-low.svgFigure 3-12 U1 Bode Plot – 15-A Load
GUID-20240110-SS0I-XPTF-ST8P-CQNMWMFTDT8G-low.pngFigure 3-11 U2 Transient Response
GUID-20240109-SS0I-89RJ-LNQS-9QTSF8VWGBXF-low.svgFigure 3-13 U2 Bode Plot – 15-A Load