GE Industrial Solutions JRW017-040-060-065-070 Series - Manual (Page 19)

Data Sheet
June 14, 2010
JRW017-070 Series Power Modules DC-DC Converters
36-75Vdc Input; 1.2Vdc to 12Vdc Output
LINEAGE POWER 19
Note that the natural convection condition was
measured at 0.05 m/s to 0.1 m/s (10ft./min. to 20
ft./min.); however, systems in which these power
modules may be used typically generate natural
convection airflow rates of 0.3 m/s (60 ft./min.) due to
other heat dissipating components in the system. The
use of Figures 53 - 59 are shown in the following
example:
Example
What is the minimum airflow necessary for a
JRW060A0F operating at VI = 48 V, an output current
of 42A, and a maximum ambient temperature of 70 °C
in transverse orientation.
Solution:
Given: VI = 48V
Io = 48A
T
A
= 70 °C
Determine airflow (V) (Use Figure 53):
V = 1m/sec. (200ft./min.)
O
UT
P
UT
CURRE
NT
, I
O
(A
)
0
2
4
6
8
10
12
14
16
18
20
20 30 40 50 60 70 80 90
Natural Convection
1.0 m/s (200 ft./min)
2.0 m/s (400 ft./min)
LOCAL AMBIENT TEMPERATURE, T
A
(
°C)
Figure 53. Output Power Derating for JRW017A0B
(Vo = 12V) in Transverse Orientation with no
baseplate; Airflow Direction From Vin(+) to Vin (-);
Vin = 48V.
O
UT
P
UT
CURRE
NT
, I
O
(A
)
0
10
20
30
40
50
60
70
20 30 40 50 60 70 80 90
Natural Convection
1.0 m/s (200 ft./min)
2.0 m/s (400 ft./min)
LOCAL AMBIENT TEMPERATURE, T
A
(
°C)
Figure 55. Output Power Derating for JRW060A0F (Vo
= 3.3V) in Transverse Orientation with no baseplate;
Airflow Direction From Vin(+) to Vin(-); Vin = 48V.
O
UT
P
UT
CURRE
NT
, I
O
(A
)
0
10
20
30
40
50
60
70
20 30 40 50 60 70 80 90
Natural Convection
1.0 m/s (200 ft./min)
2.0 m/s (400 ft./min)
LOCAL AMBIENT TEMPERATURE, T
A
(
°C)
Figure 56. Output Power Derating for JRW065A0G (Vo
= 2.5V) in Transverse Orientation with no baseplate;
Airflow Direction From Vin(+) to Vin(-); Vin = 48V.
O
UT
P
UT
CURRE
NT
, I
O
(A
)
0
10
20
30
40
50
60
70
20 30 40 50 60 70 80 90
Natural Convection
1.0 m/s (200 ft./min)
2.0 m/s (400 ft./min)
LOCAL AMBIENT TEMPERATURE, T
A
( °C)
Figure 57. Output Power Derating for JRW065A0Y (Vo
= 1.8V) in Transverse Orientation with no baseplate;
Airflow Direction From Vin(+) to Vin(-); Vin = 48V.
O
UT
P
UT
CURRE
NT
, I
O
(A
)
0
5
10
15
20
25
30
35
40
45
50
20 30 40 50 60 70 80 90
Natural Convection
1.0 m/s (200 ft./min)
2.0 m/s (400 ft./min)
LOCAL AMBIENT TEMPERATURE, T
A
(
°C)
Figure 54. Output Power Derating for JRW040A0A
(Vo = 5V) in Transverse Orientation with no
baseplate; Airflow Direction From Vin(+) to Vin (-);
Vin = 48V.