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

2.10 Powering Up and Down With VIN

Figure 2-24 shows the start-up waveforms for the TPS54J060EVM-067 with VIN ramping up to 12 V. The TPS54J061EVM-067 has similar behavior and the only difference is the soft-start time is shorter at 1.5 ms typical as a result of the lower 0.6-V reference. The start-up sequence begins as soon as the EN voltage is increased above the enable threshold voltage and the output voltage ramps up to the set value.

Figure 2-25 shows the TPS54J060EVM-067 shutdown with VIN ramping down from 12 V.

GUID-FACEA49E-C997-4E7B-B50E-90BC5AD8C8A0-low.gifFigure 2-24 VIN Start-up With 0.3-Ω Load
GUID-0D6C85F9-7215-489D-AFBB-D61A01AEEE2E-low.gifFigure 2-25 VIN Shutdown With 0.3-Ω Load