Datasheet
0
10
20
30
40
50
60
70
80
100
0 0.5 1.0 1.5 2.0
I - Output Current - A
O
Efficiency - %
2.5 3.0
90
4.03.5
8Vin
12Vin
24Vin
36Vin
48Vin
60Vin
V = 3.3V, sw = 300 kHz
OUT
f
0
10
20
30
40
50
60
70
80
100
0.001 0.01
I - Output Current - A
O
Efficiency - %
0.1
90
1
V = 3.3V, sw = 300 kHz
OUT
f
8Vin
12Vin
24Vin
36Vin
48Vin
60Vin
0
10
20
30
40
50
60
70
80
100
0.001 0.01
I - Output Current - A
O
Efficiency - %
0.1
90
1
V = 5V, sw = 600 kHz
OUT
f
8Vin
12Vin
24Vin
36Vin
48Vin
60Vin
0
10
20
30
40
50
60
70
80
100
0 0.5 1.0 1.5 2.0
I - Output Current - A
O
Efficiency - %
2.5 3.0
90
4.03.5
V = 5V, sw = 600 kHz
OUT
f
8Vin
12Vin
24Vin
36Vin
48Vin
60Vin
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Test Setup and Results
2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 1.2 A with V
IN
= 12 V, and then decreases as
the load current increases towards full load. Figure 1 shows the efficiency for the EVM. Figure 2 shows
the light-load efficiency for the EVM using a semi log scale. Figure 3 and Figure 4 show the efficiency with
VOUT adjusted to 3.3V and a 300kHz switching frequency. Measurements are taken at ambient
temperature of 25°C. The efficiency may be lower at higher ambient temperatures due to temperature
variation in the drain-to-source resistance of the internal MOSFET.
Figure 1. Efficiency Versus Load Current Figure 2. Light-Load Efficiency
Figure 3. Efficiency vs Load Current Figure 4. Light Load Efficiency
5
SLVU769B–September 2012–Revised September 2012 Using the TPS54360 Step-Down Converter Evaluation Module
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