SLUUCH6B september   2022  – september 2023 TPS543B22

 

  1.   1
  2.   Abstract
  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 (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  Efficiency
    3. 3.3  Output Voltage Regulation
    4. 3.4  Load Transient and Loop Response
    5. 3.5  Output Voltage Ripple
    6. 3.6  Input Voltage Ripple
    7. 3.7  Synchronizing to a Clock
    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 Hiccup Current Limit
    12. 3.12 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
  9. 6Revision History

3.9 Start-up and Shutdown with VIN

U2 Start-Up with VIN and U2 Shutdown with VIN show the start-up and shutdown waveforms for U2 with VIN. In U2 Start-Up with VIN, the VIN voltage ramps up and output voltage ramps up after the input and EN pin voltages reach their respective UVLO threshold. In U2 Shutdown with VIN, the VIN voltage ramps down and the TPS543B22 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 TPS543B22 is disabled because the device is no longer loading the input supply.

GUID-20220829-SS0I-9X34-GQV6-DVLDP3BQ8GCG-low.svgFigure 3-24 U2 Start-up with VIN
GUID-20220829-SS0I-DDBW-TCNX-CDFHM3GRLNRB-low.svgFigure 3-25 U2 Shutdown with VIN