SLVUAH4A August   2015  – October 2021 TPS54334

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Background
    2. 1.2 Performance Specification Summary
    3. 1.3 Modifications
      1. 1.3.1 Output Voltage Set Point
      2. 1.3.2 Adjustable UVLO
  3. 2Test Setup and Results
    1. 2.1  Input/Output Connections
    2. 2.2  Efficiency
    3. 2.3  Output Voltage Load Regulation
    4. 2.4  Output Voltage 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
    10. 2.10 Powering Down
  4. 3Board Layout
    1. 3.1 Layout
  5. 4Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Bill of Materials
  6. 5Revision History

2.2 Efficiency

The efficiency of this EVM peaks at a load current of about 0.5 A – 1 A, and then decreases as the load current increases towards full load. Figure 2-1 shows the efficiency for the TPS54334EVM-722 at an ambient temperature of 25°C.

GUID-5B21CF8C-E5AA-4EF1-B5ED-CFD9DF32E1BA-low.gifFigure 2-1 TPS54334EVM-722 Efficiency

Figure 2-2 shows the efficiency for the TPS54334EVM-722 on a semi-log scale to better show light load efficiency. The ambient temperature is 25°C.

GUID-4F7A07E4-CCA4-4B85-8F68-F72EEFACFB6F-low.gifFigure 2-2 TPS54334EVM-722 Low Current Efficiency

The efficiency may be lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the internal MOSFET.