Datasheet

Thermal Performance
2-4
Figure 2–3. Measured Board Losses
0
0.2
0.4
0.6
0.8
1
1.2
0 0.5 1 1.5 2 2.5 3
I
L
– Load Current – A
Losses – W
T
A
= 25°C
V
I
= 5 V
2.4 Thermal Performance
The junction temperature is plotted versus the load current with a 5-V input
voltage and a 25
°
C ambient temperature in Figure 2–4. The low junction-to-
case thermal resistance of the PWP package, along with a good board layout,
helps to keep the junction temperature low at high output currents. With a 5-V
input source and a 3-A load, the junction temperture is approximately 47
°
C.
Figure 2–4. Measured Junction Temperature at 25
°
C Ambient
– Junction Temperature –
20
25
30
35
40
45
50
0 0.5 1 1.5 2 2.5 3
I
L
– Load Current – A
T
A
= 25°C
V
I
= 5 V
C
°
T
J