SLVU379A August   2010  – August 2021 TPS54521

 

  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 Slow-Start Time
      3. 1.3.3 Track In
      4. 1.3.4 Adjustable UVLO
      5. 1.3.5 Input Voltage Rails
  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 Hiccup Overcurrent 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 1.1 A and then decreases as the load current increases towards full load. Figure 2-1 shows the efficiency for the TPS54521EVM-607 at an ambient temperature of 25°C.

GUID-54E9891E-6E2F-4297-94BF-8D15D93DE9EA-low.gifFigure 2-1 TPS54521EVM-607 Efficiency

Figure 2-2 shows the efficiency for the TPS54521EVM-607 at lower output currents below 0.10 A at an ambient temperature of 25°C.

GUID-B97AC8BA-CEDE-47F8-A4E1-9C782BF58D9D-low.gifFigure 2-2 TPS54521EVM-607 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 MOSFETs.