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 well designed board layout, allows the TPS54973EVM−017 EVM to output
full rated load current while maintaining safe junction temperatures. With a
3.3-V input source and a 9-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 2−3. Power dissipaton is shown for an input
voltage of 3.3 V. For additional information on the dissipation ratings of the
devices, see the individual product data sheets.
Figure 2−3. Measured Circuit Losses
0
0.5
1
1.5
2
2.5
3
3.5
4
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− Power Dissipation − W
P
D
I
O
− Output Current − A
POWER DISSIPATION
vs
OUTPUT CURRENT
V
I
= 3.3 V