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

3.8 Start-up and Shutdown with EN

Figure 3-16 and Figure 3-17 show the start-up and shutdown waveforms using EN. In Figure 3-16, the input voltage is initially applied and the output is inhibited by pulling EN to GND. When the EN voltage is increased above the enable-threshold voltage, the start-up sequence begins and the output voltage ramps up to the externally set value. Figure 3-17 shows EN shutdown with no load.

Figure 3-18 shows EN start-up with a 6-A load.

TP11 for EN can be used to test the EN start-up. EN is high if there is power, and is low if tied to AGND.

GUID-20231016-SS0I-LTTV-PMJ3-HJVZHNB8DFSS-low.svgFigure 3-16 U1 Start-Up with EN – No Load
GUID-20231016-SS0I-QN4W-BW6C-HXL4H8D3G2B2-low.svgFigure 3-18 U1 Start-up with EN - 6-A Load
GUID-20231016-SS0I-SVDZ-RW3L-RJQGJL2R9SKH-low.svgFigure 3-17 U1 Shutdown with EN – No Load