GE Industrial Solutions EHHD024A0A HAMMERHEAD Series - Manual (Page 9)

GE
Datasheet
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75V
dc
Input; 5V
dc
, 24A, 120W Output
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 9
Thermal Considerations (continued)
The thermal reference points, T
ref1
, & T
ref2
, used in the
specifications for open frame modules are shown in Figure
13. For reliable operation these temperatures should not
exceed 120
O C and 124 O C
Figure 13. T
ref
Temperature Measurement Locations for
Open Frame Module.
The thermal reference point, T
ref
, used in the specifications
for modules with heatplate is shown in Figure 14. For
reliable operation this temperature should not exceed 105
O C.
Figure 14. T
ref
Temperature Measurement Location for
Module with Heat plate.
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
each module versus local ambient temperature (T
A
)
for natural convection and up to 3m/s (600 ft./min) forced
airflow are shown in Figures 15 - 21.
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.
O
U
TP
UT CURR
ENT, I
O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 15. Output Current Derating for the Open Frame
Module; Airflow in the Transverse Direction from V
out
(-) to
V
out
(+); V
IN
=48V, V
O
=5V.
OUTPUT CURRENT
, I O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 16. Output Current Derating for the Module with
Heatplate; Airflow in the Transverse Direction from V
out
(-)
to V
out
(+);V
IN
=48V, V
O
=5V.
T ref 1
T
ref 2
AIRFLOW
0
4
8
12
16
20
24
25 35 45 55 65 75 85
NC
100LFM
(0.5m/s)
200LFM
(1.0m/s)
400LFM
(2.0m/s)
600LFM
(3.0m/s)
0
4
8
12
16
20
24
25 35 45 55 65 75 85
NC
100LFM
(0.5m/s)
200LFM
(1.0m/s)
400LFM
(2.0m/s)