Datasheet

0
10
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60
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90
100
0 1 2 3 4 5 6 7 8
Output Current (A)
Efficiency (%)
VIN = 8 V
VIN = 12 V
VIN = 17 V
G001
0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Output Current (A)
Efficiency (%)
VIN = 8 V
VIN = 12 V
VIN = 17 V
G002
www.ti.com Test Setup and Results
2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 2 A and then decreases as the load current
increases toward full load. Figure 1 shows the efficiency for the TPS54821EVM-049 at an ambient
temperature of 25°C.
Figure 1. TPS54821EVM-049 Efficiency
Figure 2 shows the efficiency for the TPS54821EVM-049 using a semi-log scale to more easily show
efficiency at lower output currents. The ambient temperature is 25°C.
Figure 2. TPS54821EVM-049 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
SLVU479– October 2011 TPS54821EVM-049, 8-A, SWIFT™ Regulator— Evaluation Module
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