SLVU263A August   2008  – October 2021 TPS54231

 

  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
  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 Eco-mode Operation
    11. 2.11 Thermal Characteristics
  4. 3Board Layout
    1. 3.1 Layout
    2. 3.2 Estimated Circuit Area
  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 TPS54231EVM-372 at an ambient temperature of 25°C.

GUID-99B6DDBC-6709-4D09-9DC3-58F480E24F9A-low.gifFigure 2-1 TPS54231EVM-372 Efficiency

Figure 2-2 shows the efficiency for the TPS54231EVM-372 at lower output currents between 0.02 A and 0.20 A at an ambient temperature of 25°C.

GUID-CFFD399A-A351-440F-88C8-EB3DCD98EC58-low.gifFigure 2-2 TPS54231EVM-372 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.