Efficiency
2-3
Test Setup and Results
2.2
Efficiency
The TPS54980EVM−022 efficiency peaks at a 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 of the TPS54980 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. 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, TPS54980
50
55
60
65
70
75
80
85
90
95
100
0
1
2
3
4
5
6
7
8
9
10
IO − Output Current − A
Efficiency − %
EFFICIENCY
vs
OUTPUT CURRENT
VI = 3.3 V
Summary of Contents for TPS54980EVM-022
Page 1: ...E September 2003 PMP Systems Power User s Guide SLVU090...
Page 8: ...4...
Page 14: ...1 6...
Page 29: ...Layout 3 3 Board Layout Figure 3 2 Internal Layer 2 Figure 3 3 Internal Layer 3...
Page 30: ...Layout 3 4 Figure 3 4 Bottom Side Layout looking from top side Figure 3 5 Top Side Assembly...
