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.

Figure 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.

Figure 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.