Datasheet

Efficiency
2-3
Test Setup and Results
2.2 Efficiency
The TPS54x72EVM−222 efficiency peaks at load current of about 2 A, and
then decreases as the load current increases towards full load. The efficiency
shown in Figure 2−2 is for 5-V (TPS54672, TPS54872) and 3.3 V (TPS54972)
inputs 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. The efficiency is slightly lower at 700 kHz than at
lower switching frequencies, due to the gate and switching losses in the
MOSFETs.
Figure 2−2. Measured Efficiency
50
55
60
65
70
75
80
85
90
95
100
0246810
TPS54972
TPS54672
TPS54872
Efficiency − %
EFFICIENCY
vs
OUTPUT CURRENT
I
O
− Output Current − A