QW050A1 Lineage Power, QW050A1 Datasheet - Page 13

• Manufacturer Part Number: QW050A1
• Description: CONVERTER DC/DC 5V 50W OUT
• Manufacturer: Lineage Power
• Series: QWr
• Type: Isolated with Remote On/Offr

Specifications of QW050A1

• Output: 5V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 5 VDC @ 10A
• 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: 84%
• Approvals: CE, CSA, UL, VDE
• Output Current: 10A
• Input Voltage: 48V
• Output Voltage: 5V
• Output Power: 50
• Screening Level: Industrial
• Operating Temperature Min Deg. C: -40C
• Operating Temperature Max Deg. C: 100C
• Product Length (mm): 36.8mm
• Product Depth (mm): 57.9mm
• Product Height (mm): 12.7mm
• Mounting Style: Through Hole
• Pin Count: 8
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Lead Free Status / Rohs Status: RoHS Not Applicable

April 2008
Thermal Considerations
Heat Transfer Without Heat Sinks
Figure 25. Forced Convection Power Derating with
Heat Transfer with Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to attach to the module. The mounting torque must not
exceed 0.56 N-m (5 in.-lb.). For a screw attachment
from the pin side, the recommended hole size on the
customer’s PWB around the mounting holes is 0.130
± 0.005 inches. If a larger hole is used, the mounting
torque from the pin side must not exceed 0.25 N-m
(2.2 in.-lbs.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total
module thermal resistance (θca) is defined as the max-
imum case temperature rise (ΔT
module power dissipation (P
The location to measure case temperature (T
shown in Figure 22. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations, heights, and orientations, as shown in
Figures 26 and 27. Longitudinal orientation is defined
as the long axis of the module that is parallel to the air-
flow direction, whereas in the transverse orientation,
the long axis is perpendicular to the airflow. These
curves were obtained by experimental testing of heat
sinks, which are offered in the product catalog.
Lineage Power
θ
20
15
10
ca
5
0
0
=
10
No Heat Sink; Either Orientation
ΔT
---------------------
LOCAL AMBIENT TEMPERATURE, T
P
20
C max
,
D
30
=
40
(
----------------------- -
T
D
C
50
):
P
–
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W and 75 W
D
C, max
T
60
A
(continued)
)
4.0 m/s (800 ft./min.)
3.5 m/s (700 ft./min.)
3.0 m/s (600 ft./min.)
2.5 m/s (500 ft./min.)
2.0 m/s (400 ft./min.)
1.5 m/s (300 ft./min.)
1.0 m/s (200 ft./min.)
0.5 m/s (100 ft./min.)
0.1 m/s (20 ft./min.)
NATURAL CONVECTION
) divided by the
70
A
80
(˚C)
(continued)
C
) is
90
8-2306 (C).a
100
Figure 26. Case-to-Ambient Thermal Resistance
Figure 27. Case-to-Ambient Thermal Resistance
CONV
CONV
NAT
11
10
NAT
11
10
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
Curves; Transverse Orientation
Curves; Longitudinal Orientation
(100)
(100)
0.5
0.5
AIR VELOCITY, m/s (ft./min. )
AIR VELOCITY, m/s (ft./min.)
(200)
(200)
1.0
1.0
(300)
(300)
1.5
1.5
NO HEAT SINK
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
1 IN. HEAT SINK
NO HEAT SINK
1/4 IN. HEAT SINK
1/2 IN. HEAT SINK
1 IN. HEAT SINK
(400)
(400)
2.0
2.0
(500)
(500)
2.5
2.5
8-2107 (C)
8-2108 (C)
(600)
(600)
3.0
3.0
13