SLVU151A April   2013  – August 2021 TPS54350 , TPS54550

 

  1.   Trademarks
  2. 1Background
  3. 2Performance Specification Summary
  4. 3Modifications
    1. 3.1 Output Voltage Set Point
    2. 3.2 Input Voltage Range
  5. 4Test Setup and Results
    1. 4.1 Input / Output Connections
    2. 4.2 Efficiency
    3. 4.3 Output Voltage Regulation
    4. 4.4 Load Transients
    5. 4.5 Loop Characteristics
    6. 4.6 Output Voltage Ripple
    7. 4.7 Input Voltage Ripple
    8. 4.8 Powering Up
  6. 5Board Layout
    1. 5.1 Layout
  7. 6Schematic and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
  8. 7Revision History

4.2 Efficiency

The TPS54550EVM-158 efficiency peaks at load current of about 1 A to 3 A, depending on input voltage, and then decreases as the load current increases towards full load. Figure 4-1 shows the efficiency for the TPS54550EVM-158 at an ambient temperature of 25°C. The efficiency is lower at higher ambient temperatures, due to temperature variation in the drain-to-source resistance of the MOSFETs.

GUID-F1275A5E-3372-4082-91F4-F5DAF7F44A17-low.gifFigure 4-1 Measured Efficiency, TPS54550