GE Industrial Solutions EHHD015A0A Hammerhead Series - Manual (Page 10)

GE Data Sheet
EHHD015A0A Hammerhead™ Series; DC-DC Converter Power Modules
18-75Vdc Input; 5Vdc, 15.0A, 75W Output
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 10
Thermal Considerations (continued)
OUT
PUT
C
U
RRENT
, I O
(A)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 18. Output Current Derating for the Module with
-18H Heatplate; Airflow in the Transverse Direction from
V
out
(-) to V
out
(+);V
IN
=48V, V
O
=5.0V
OUTPUT C
U
RR
EN
T, I
O
(A)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 19. Output Current Derating for the Open Frame
Module; Airflow in the Transverse Direction from V
out
(-) to
V
out
(+); V
IN
=24V, V
O
=5.0V.
OUTPUT CUR
REN
T, I
O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 20. Output Current Derating for the Module with
Heatplate; Airflow in the Transverse Direction from V
out
(-)
to V
out
(+);V
IN
=24V, V
O
=5.0V.
OU
TPUT
CURRENT,
I O
(A
)
AMBIENT TEMEPERATURE, T
A
( o C )
Figure 21. Output Current Derating for the Module with
-18 Heatplate; Airflow in the Transverse Direction from
V
out
(-) to V
out
(+);V
IN
=24V, V
O
=5.0V.
Heat Transfer via Conduction
The module can also be used in a sealed environment with
cooling via conduction from the
module’s top surface through a gap pad material to a
cold wall, as shown in Figure 22. This capability is achieved
by insuring the top side component skyline profile achieves
no more than 1mm height difference between the tallest
and the shortest power train part that benefits from contact
with the gap pad material. The output current derating
versus cold wall temperature, when using a gap pad such as
Bergquist GP2500S20, is shown in Figure 23.
Figure 22. Cold Wall Mounting
OUTPUT C
U
RR
EN
T, I
O
(A)
COLDPLATE TEMEPERATURE, T
C
( o C)
Figure 23. Derated Output Current versus Cold Wall
Temperature with local ambient temperature around
module at 85C; V
IN
=24V or 48V.