JHW050FG Datasheet, PDF (11/17 Pages) Lineage Power Corporation – JHW050 Dual Positive Output-Series Power Modules dc-dc Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs 50W

Data Sheet
April 2008
JHW050 Dual Positive Output-Series Power Modules: dc-dc
Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 50W
Thermal Considerations
The power module can operate in a variety of thermal
environments, however, sufficient cooling should be
provided to help ensure reliable operation.
Considerations include Ambient temperature, airflow,
module power dissipation, and need for increased reli-
ability. A reduction in the operating temperature of the
module will result in an increase in reliability.
The thermal data presented here is based on measure-
ments taken in a wind tunnel using the test setup
shown in Figure 22.
Note that the orientation of the module with respect to
the airflow affects thermal performance. Two orienta-
tions are shown below in Figure 20 and 21.
Note: Proper cooling can be verified by measuring the
temperature at the top center of the case of the two Tref
components Q9 and Q2. For reliable operation neither
temperature measured should exceed 110 °C.
Figure 20.Worst Orientation (Top View)
1-0865
Figure 21.Best Orientation (Top View)
1-0866
Figure 22.Thermal Test Setup
1-0867
14
12
10
8
6
4
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
2
1.0 m/s (200 ft./min.)
NATURAL CONVECTION
0
0 10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE ˚C
1-0868
Figure 23.JHW050AF Typical Maximum total Output
Current vs. Local Ambient Temperature
and Air Velocity; Worst case orientation
18
16
14
12
10
8
3.0 m/s (600 ft./min.)
6
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
4
NATURAL CONVECTION
2
0
0 10 20 30 40 50 60 70 80 90 100
AMBIENT TEMPERATURE ˚C
1-0869
Figure 24.JHW050FG &FY typical Maximum total
Output Current vs. Local Ambient
Temperature and Air Velocity; Worst case
orientation
Lineage Power
11