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

3.7 Start-up and Shutdown with VIN

Figure 3-18 and Figure 3-19 show the start-up and shutdown waveforms for U1 with VIN. In Figure 3-18, the VIN voltage ramps up and output voltage ramps up after the input and EN pin voltages reach their respective threshold. In Figure 3-19, the VIN voltage ramps down and the TPSM843B22 shuts down when the input or EN pin voltage reach their respective threshold. The rate at which VIN ramps down changes as soon as the TPSM843B22 is disabled because it is no longer loading the input supply.

GUID-20230405-SS0I-DBC1-SSSR-32WNCT12MKW4-low.gifFigure 3-18 U1 Start-up with VIN – No Load
GUID-20230405-SS0I-LXJP-G5XW-PCBXFVR3BB1S-low.gifFigure 3-19 U1 Shutdown with VIN – 5-A Load