Data Sheet
EUE Series DC-DC Power Modules:
March 19, 2009
42-55/42-58Vdc Input; 12Vdc Output; 200/120W
EUE200, you can limit this temperature to a lower
value for improved reliability.
250
2.0 m/s
(400 lfm)
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.
200
150
NC
100
50
0
0.5 m/s
(100 lfm)
Heat Transfer via Convection
1.0 m/s
(200 lfm)
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 Tref
temperature versus local ambient temperature (TA).
The plots are for different airflow conditions ranging
from 1m/s (200ft./min.) to 3m/s (600 ft./min).
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°C)
Figure 23. Output Power Derating for the
EUE200B1 (Vo = 12.0V) in the Transverse
Orientation; Airflow Direction From Vin(-) to Vin(+);
Vin = 48V.
The use of Figures 22 - 24 is shown in the following
example:
250
2.0 m/s
(400 lfm)
200
Example
150
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?
NC
100
50
0
0.5 m/s
(100 lfm)
1.0 m/s
(200 lfm)
Solution:
20
30
40
50
60
70
80
90
Given: VI = 48V
LOCAL AMBIENT TEMPERATURE, TA (°C)
Po = 150W
Figure 24. Output Power Derating for the
EUE200B1-H (Vo = 12.0V) in the Transverse
Orientation; Airflow Direction From Vin(-) to Vin(+);
Vin = 48V.
TA = 70 °C
Determine airflow (V) (Use Figure 23):
V = 1.0 m/sec. (200 ft./min.)
130
120
110
2 m/s
(400LFM)
1 m/s
(200LFM)
100
90
20
30
40
50
60
70
80
90
LOCAL AMBIENT TEMPERATURE, TA (°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 ]
