SLVU151A April 2013 – August 2021 TPS54350 , TPS54550
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.