SLUUCK9 april   2023 TPSM843B22

 

  1.    TPSM843B22EVM 20-A, Regulator Evaluation Module
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  4. 2Configurations and Modifications
    1. 2.1 Output Voltage
    2. 2.2 Switching Frequency (FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MSEL Pin)
    4. 2.4 Enable, UVLO (EN Pin)
  5. 3Test Setup and Results
    1. 3.1 Input and Output Connections
    2. 3.2 Efficiency
    3. 3.3 Output Voltage Regulation
    4. 3.4 Load Transient and Loop Response
    5. 3.5 Input Voltage Ripple
    6. 3.6 Start-up and Shutdown with EN
    7. 3.7 Start-up and Shutdown with VIN
    8. 3.8 Start-up Into Pre-Bias
    9. 3.9 Thermal Performance
  6. 4Board Layout
    1. 4.1 Layout
  7. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials

3.4 Load Transient and Loop Response

Figure 3-8 shows the load transient response. The current step is from 0 A to 20 A and the current step slew rate is 0.5 A/us. An electronic load is used to provide the step. The VOUT voltage is measured using J7 SMB connector.

Figure 3-9 shows the loop characteristic. Gain and phase plots are shown for VIN voltage of 12-V and 20-A load.

GUID-20230405-SS0I-HRVH-MNHN-XMKXWDWLSTKK-low.gifFigure 3-8 U1 Transient Response
GUID-20230410-SS0I-419Z-8RBN-PZ1G8XZG8TD9-low.svgFigure 3-9 U1 Bode Plot – 20-A Load

Figure 3-10 and Figure 3-11 shows the loop characteristics for U1 with the three different ramp settings.

GUID-20230410-SS0I-0KQD-L1LT-Q27JK19BRT8B-low.svgFigure 3-10 U1 Loop Gain with Different Ramp Settings
GUID-20230410-SS0I-HCSZ-HZBS-ZHKQJ8MWVZRW-low.svgFigure 3-11 U1 Loop Phase with Different Ramp Settings