SNVU658B March   2020  – May 2021 TPS54J060 , TPS54J061

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Setpoint
      2. 1.3.2 Frequency and Operation Mode Setting
      3. 1.3.3 Enable Pin Selection
      4. 1.3.4 Adjustable UVLO
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Start Up Procedure
    3. 2.3  Efficiency
    4. 2.4  Load and Line Regulation
    5. 2.5  Load Transients
    6. 2.6  Loop Characteristics
    7. 2.7  Output Voltage Ripple
    8. 2.8  Input Voltage Ripple
    9. 2.9  Powering Up and Down with EN
    10. 2.10 Powering Up and Down With VIN
    11. 2.11 Start-Up Into Pre-Bias
    12. 2.12 Current Limit
  4. 3Schematic, List of Materials, and Layout
    1. 3.1 Schematic
    2. 3.2 List of Materials
    3. 3.3 Layout
  5.   Revision History

2.12 Current Limit

Figure 2-27 shows the latch off current limit of the TPS54J060EVM-067. The output current ramps up to a constant current of 7.5 A set by the electronic load and the output voltage begins to drop due to the valley current limit of the TPS54J060. When the output voltage drops below the under voltage protection threshold, the TPS54J060 latches off. As a result of the latch off protection, the output will only recover after pulling EN pin low then high or turning the input voltage off then on.

Figure 2-28 and Figure 2-29 shows the hiccup current limit of the TPS54J061EVM-067. When the output voltage drops below the UVP threshold, the TPS54J061 stops switching and after the hiccup timeout period attempts to restart. When the overload is removed the output of the TPS54J061 recovers.

GUID-84B31B9B-8054-4E34-AF29-CCBD407C487F-low.gifFigure 2-27 TPS54J060EVM-067 Latch Off Current Limit
GUID-20200921-CA0I-FS8J-8BTZ-NSXL9DS4SPL9-low.gifFigure 2-28 TPS54J061EVM-067 Entering Hiccup
GUID-20200921-CA0I-HZ9S-FPDD-H1FD6NVFQDCG-low.gifFigure 2-29 TPS54J061EVM-067 Recovering From Hiccup