Texas Instruments TPS54373EVM-237, Руководство пользователя, Страница: 17 / 36

Efficiency
2-3 Test Setup and Results
2.2 Efficiency
The TPS54373EVM-237 efficiency peaks at load current of about 1 A to 2 A,
and then decreases as the load current increases towards full load. Figure 2–2
shows the efficiency for the TPS54373 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, TPS54373
50
55
60
65
70
75
80
85
90
95
100
0 0.5 1 1.5 2 2.5 3 3.5
Efficiency – %
EFFICIENCY
vs
OUTPUT CURRENT
IO – Output Current – A
VI = 5 V
VI = 3.3 V