SLVUBQ1A August   2020  – May 2021 TPS543620

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Before You Begin
    3. 1.3 Performance Characteristics Summary
  3. 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
  4. 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 Overvoltage Protection
    13. 3.13 Thermal Performance
  5. 4Board Layout
    1. 4.1 Layout
  6. 5Schematic and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 Bill of Materials
  7. 6Revision History

Hiccup Current Limit

Figure 3-33 through Figure 3-36 show the TPS543620 hiccup current limit feature. These waveforms are measured using U2. Figure 3-33 and Figure 3-34 show the response to an overload with the High and Low current limit settings. Figure 3-33 and Figure 3-35 show the response to a hard short on the output with the High and Low current limit settings.

Figure 3-36 shows the TPS543620 entering hiccup with an overload on the output and the High current limit setting with a longer timescale. The TPS543620 tries to restart after the Hiccup wait time period but the overload was still present on the output. In the next restart attempt, the overload has been removed so the TPS543620 starts up normally.

GUID-1DD1E3AC-5E9A-414D-AC3D-B0ED917EBCA0-low.gifFigure 3-33 U2 Output Overcurrent Protection – Overload with High Limit
GUID-8850AB63-4A16-482E-BD6F-0BE53154126C-low.gifFigure 3-35 U2 Output Overcurrent Protection – Short with Low Limit
GUID-6B278D18-DDA7-43BF-9281-E33214C18E37-low.gifFigure 3-34 U2 Output Overcurrent Protection – Overload with Low Limit
GUID-4AD8FE0A-4265-4A6E-9D3B-C5ACCABC9111-low.gifFigure 3-36 U2 OCP Hiccup and Recover – High Limit