Datasheet
Thermal Performance
2-4
Figure 2–3. Measured Board Losses
0
0.5
1
1.5
2
2.5
0123456
F
SW
= 350 kHz
F
SW
= 550 kHz
T
A
= 25°C
I
L
– Load Current – A
Losses – W
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 case temperature
is plotted in Figure 2–5. 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 6-A
load, the junction temperature is approximately 60°C, while the case
temperature is approximately 55°C.
Figure 2–4. Measured Junction Temperature at 25°C Ambient
0
10
20
30
40
50
60
70
0123456
F
SW
= 350 kHz
F
SW
= 550 kHz
T
A
= 25°C
I
L
– Load Current – A
– Junction Temperature –
C
°
T
J