Datasheet

0
10
20
30
40
50
60
70
80
90
100
0 0
.
5
1 1.
5
2 2.
5
3 3
.
5
4
Output Current - A
Efficiency - %
V = 3.3 V
IN
V = 5 V
IN
0
10
20
30
40
50
60
70
80
90
100
0
.
00
1
0
.
0
1
0
.1 1 1
0
Output Current - A
Efficiency - %
V = 3.3 V
IN
V = 5 V
IN
www.ti.com Test Setup and Results
2.2 Efficiency
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 1 shows the efficiency for the TPS54478EVM-037 at an
ambient temperature of 25°C.
Figure 1. TPS54478EVM-037 Efficiency
Figure 2 shows the efficiency for the TPS54478EVM-037 at lower output currents between 0.02 A and
0.20 A at an ambient temperature of 25°C.
Figure 2. TPS54478EVM-037 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.
5
SLVU470–June 11 TPS54478EVM-037 4-A, SWIFT™ Regulator Evaluation Module
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