Datasheet
Current Sharing Thermal Derating Curves
20
60
70
90
T
A
– Ambient Temperature – °C
30
40
50
80
0 80604020
I
O
– Ouput Current – A
V
I
= 12 V
V
O
= 3.3 V
400 LFM
200 LFM
100 LFM
400 LFM
200 LFM
100 LFM
Nat conv
Natural
Convection
20
60
70
90
T
A
– Ambient Temperature – °C
80
0 80604020
I
O
– Ouput Current – A
400 LFM
200 LFM
100 LFM
30
40
50
V
I
= 12 V
V
O
= 5 V
400 LFM
200 LFM
100 LFM
Nat conv
Natural
Convection
PTH08T255W
SLTS290 – NOVEMBER 2008 ...........................................................................................................................................................................................
www.ti.com
The temperature derating curves in Figure 20 and Figure 21 represent the conditions at which internal
components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to two
PTH08T255W modules soldered directly to a 100 mm × 200 mm double-sided PCB with 2 oz. copper and the
direction of airflow from pins 10 to pins 22. For surface mount packages (AS and AZ suffix), multiple vias must
be utilized. Please refer to the mechanical specification for more information.
AMBIENT TEMPERATURE AMBIENT TEMPERATURE
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 20. Figure 21.
26 Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): PTH08T255W