Data Sheet
March 19, 2009
EUE200, you can limit this temperature to a lower
value for improved reliability.
Please refer to the Application Note “Thermal
Characterization Process For Open-Frame Board-
Mounted Power Modules” for a detailed discussion of
thermal aspects including maximum device
temperatures.
EUE Series DC-DC Power Modules:
42-55/42-58Vdc Input; 12Vdc Output; 200/120W
250
2.0 m/s
(400 lfm)
OUTPUT POWER, P
O
(W)
200
150
NC
100
0.5 m/s
(100 lfm)
1.0 m/s
(200 lfm)
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. The derating plots in figures
22 to 24 show the maximum output current that can
be delivered by each module in the respective
orientation without exceeding the maximum T
ref
temperature versus local ambient temperature (T
A
).
The plots are for different airflow conditions ranging
from 1m/s (200ft./min.) to 3m/s (600 ft./min).
The use of Figures 22 - 24 is shown in the following
example:
50
0
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, T
A
(°C)
Figure 23. Output Power Derating for the
EUE200B1 (Vo = 12.0V) in the Transverse
Orientation; Airflow Direction From Vin(-) to Vin(+);
Vin = 48V.
250
2.0 m/s
(400 lfm)
Example
What is the minimum airflow necessary for a
EUE200B1 operating at VI = 48 V, an output power of
150W, and a maximum ambient temperature of 70 °C
in transverse orientation?
Solution:
Given: VI = 48V
Po = 150W
TA = 70 °C
Determine airflow (V) (Use Figure 23):
V = 1.0 m/sec. (200 ft./min.)
OUTPUT POWER, P
O
(W)
200
150
NC
100
0.5 m/s
(100 lfm)
1.0 m/s
(200 lfm)
50
0
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, T
A
(°C)
Figure 24. Output Power Derating for the
EUE200B1-H (Vo = 12.0V) in the Transverse
Orientation; Airflow Direction From Vin(-) to Vin(+);
Vin = 48V.
130
OUTPUT POWER, P
O
(W)
120
110
2 m/s
(400LFM)
1 m/s
(200LFM)
100
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, T
A
(°C)
Figure 22. Output Power Derating for the
EUE120B1 (Vo = 12.0V) in the Transverse
Orientation; Airflow Direction From Vin(-) to Vin(+);
Vin = 48V.
LINEAGE
POWER
11
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
