Power Dissipation
2-4
2.3
Power Dissipation
The low junction-to-case thermal resistance of the PWP package, along with
a good board layout, allows the TPS54350EVM−235 EVMs to output full rated
load current while maintaining safe junction temperatures. With a 12-V input
source and a load approaching the current limit of 4.2 A, the junction
temperature is approximately 47
°
C. The total circuit losses at 25
°
C are shown
in Figure 2−3. Power dissipation is shown for input voltages of 6 V, 12 V and
18 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
0
0.5
1
1.5
2
2.5
3
3.5
− Power Dissipation − W
P
D
IO − Output Current − A
POWER DISSIPATION
vs
OUTPUT POWER
VI = 18 V
VI = 12 V
VI = 6 V