QHW075F1-Q Lineage Power, QHW075F1-Q Datasheet - Page 15

• Manufacturer Part Number: QHW075F1-Q
• Description: CONVRTR DC/DC 3.3V 49.5W OUT
• Manufacturer: Lineage Power
• Series: QHWr
• Type: Isolated with Remote On/Offr

Specifications of QHW075F1-Q

• Output: 3.3V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 3.3 VDC @ 15A
• Size / Dimension: 2.28" L x 1.45" W x 0.50" H (57.9mm x 36.8mm x 12.7mm)
• Power (watts) - Rated: 50W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 81%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

Data Sheet
April 2008
Thermal Considerations
Heat Transfer with Heat Sinks
Figure 32. Heat Sink Power Derating Curves;
Figure 33. Heat Sink Power Derating Curves;
Lineage Power
20
15
10
20
15
10
5
0
5
0
0
0
10
10
Natural Convection; Transverse
Orientation
Natural Convection; Longitudinal
Orientation
LOCAL AMBIENT TEMPERATURE, T
LOCAL AMBIENT TEMPERATURE, T
20
20
30
30
40
40
dc-dc Converters: 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 66 W
50
50
QHW050F1-Q, QHW075F1-Q, and QHW100F1-Q Power Modules;
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
60
60
(continued)
1 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
NO HEAT SINK
70
70
(continued)
80
80
A
A
(°C)
(°C)
90 100
90 100
8-2889(F)
8-2890(F)
Figure 34. Heat Sink Power Derating Curves;
Figure 35. Heat Sink Power Derating Curves;
These measured resistances are from heat transfer
from the sides and bottom of the module as well as the
top side with the attached heat sink; therefore, the
case-to-ambient thermal resistances shown are gener-
ally lower than the resistance of the heat sink by itself.
The module used to collect the data in Figures 30 and
31 had a thermal-conductive dry pad between the case
and the heat sink to minimize contact resistance. The
use of Figure 30 is shown in the following example.
20
15
10
20
15
10
5
0
5
0
0
0
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
1/4 IN. HEAT SINK
10
10
1 IN. HEAT SINK
1.0 m/s (200 lfm); Transverse
Orientation
1 IN. HEAT SINK
1.0 m/s (200 lfm); Longitudinal
Orientation
LOCAL AMBIENT TEMPERATURE, T
LOCAL AMBIENT TEMPERATURE, T
NO HEAT SINK
NO HEAT SINK
20
20
30
30
40
40
50
50
60
60
70
70
80
80
A
A
(°C)
(°C)
90 100
90 100
8-2891(F)
8-2892(F)
15