Datasheet

Power Dissipation
2-5
Test Setup and Results
2.3 Power Dissipation
The low junction-to-case thermal resistance of the PWP package, along with
a good board layout, allows the TPS54x73EVM-225 EVMs to output full rated
load current while maintaining safe junction temperatures. With a 3.3-V input
source and a 6-A load, the junction temperature is approximately 60°C, while
the case temperature is approximately 55°C. The total circuit losses at 25°C
are shown in Figure 2–4. The input voltage for the TPS54673 is 3.3 V and for
the TPS54673, 5.0 V. For additional information on the dissipation ratings of
the devices, see the individual product data sheets.
Figure 2–4. Measured Circuit Losses
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
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POWER DISSIPATION
vs
OUTPUT CURRENT
I
O
– Output Current – A
– Power Dissipation – W
P
D
TPS54673
TPS57873