Data Sheet
June 29, 2009
EHW015A0A Series Eighth-Brick Power Modules
36–75Vdc Input; 5.0Vdc Output; 15A Output Current
natural convection and up to 3m/s (600 ft./min) forced
airflow are shown in Figures 16 -19.
16
Thermal Considerations
(continued)
OUTPUT CURRENT, I
O
(A)
14
12
10
8
6
4
2
0
20
30
40
50
60
70
o
AIRFLOW
Figure 13. T
ref
Temperature Measurement Location
for Open Frame Module.
3.0 m/s
(600 LFM)
2.0 m/s
(400 LFM)
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
80
90
AMBIENT TEMEPERATURE, T
A
( C
)
Figure 16. Output Current Derating for the Module
with Heatplate; Airflow in the Transverse Direction
from Vout(+) to Vout(-); Vin =48V.
AIRFLOW
16
14
12
10
8
6
4
2
0
20
30
40
50
60
70
o
Figure 14. T
ref
Temperature Measurement Location
for Module with Heatplate.
OUTPUT CURRENT, I
O
(A)
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. Derating curves showing the
maximum output current that can be delivered by the
open frame module versus local ambient temperature
(T
A
) for natural convection and up to 3m/s (600 ft./min)
forced airflow are shown in Figure 15.
16
3.0 m/s
(600 LFM)
2.0 m/s
(400 LFM)
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
80
90
AMBIENT TEMEPERATURE, T
A
( C
)
OUTPUT CURRENT, I
O
(A)
14
12
10
8
6
4
2
0
20
30
40
50
60
70
o
3.0 m/s
(600 LFM)
2.0 m/s
(400 LFM)
Figure 17. Output Current Derating for the Module
with Heatplate and 0.25 in. heat sink; Airflow in the
Transverse Direction from Vout(+) to Vout(-); Vin
=48V.
16
OUTPUT CURRENT, I
O
(A)
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
80
90
14
12
10
8
6
4
2
0
20
30
40
50
60
70
o
AMBIENT TEMEPERATURE, T
A
( C
)
Figure 15. Output Current Derating for the Open
Frame Module; Airflow in the Transverse Direction
from Vout(+) to Vout(-); Vin =48V.
For additional power, the module is available with an
optional heatplate (-H), that allows for the use of heat
sinks to improve the thermal derating. Derating curves
showing the maximum output current that can be
delivered by the heatplate module with different heat
sink heights versus local ambient temperature (T
A
) for
3.0 m/s
(600 LFM)
2.0 m/s
(400 LFM)
1.0 m/s
(200 LFM)
0.5 m/s
(100 LFM)
NC
80
90
AMBIENT TEMEPERATURE, T
A
( C
)
Figure 18. Output Current Derating for the Module
with Heatplate and 0.5 in. heat sink; Airflow in the
Transverse Direction from Vout(+) to Vout(-); Vin
=48V.
LINEAGE
POWER
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
