SLUUCR2 October   2023 TPSM843620

 

  1.   1
  2.    TPSM843620EVM 6-A, SWIFT™ 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 Switching Frequency (SYNC/FSEL Pin)
    3. 2.3 Current Limit, Soft-Start Time, and Internal Compensation (MODE Pin)
    4. 2.4 Adjustable UVLO
  6. 3Test Setup and Results
    1. 3.1  Input/Output Connections
    2. 3.2  BOM Modifications for Spins
    3. 3.3  Efficiency
    4. 3.4  Output Voltage Regulation
    5. 3.5  Load Transient and Loop Response
    6. 3.6  Output Voltage Ripple
    7. 3.7  Input Voltage Ripple
    8. 3.8  Start-up and Shutdown with EN
    9. 3.9  Start-up and Shutdown with VIN
    10. 3.10 Start-up Into Pre-Bias
    11. 3.11 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

3.9 Start-up and Shutdown with VIN

Figure 3-19 and Figure 3-20 show the start-up and shutdown waveforms with VIN. In Figure 3-19, the VIN voltage ramps up and output voltage ramps up after the input and EN pin voltages reach their respective UVLO threshold. In Figure 3-20, the VIN voltage ramps down and the TPSM843620 shuts down when the input or EN pin voltage reach their respective UVLO threshold. The rate at which VIN ramps down changes as soon as the TPSM843620 is disabled because the device is no longer loading the input supply.

GUID-20231016-SS0I-K3XM-M7VK-NV8B245PCB0M-low.svgFigure 3-19 U1 Start-up with VIN – No Load
GUID-20231016-SS0I-WTNP-V1G2-XN1VZVXHSBJG-low.svgFigure 3-20 U1 Shutdown with VIN – 6-A Load