QW075A1 Lineage Power, QW075A1 Datasheet - Page 12

• Manufacturer Part Number: QW075A1
• Description: CONVERTER DC/DC 5V 75W OUT
• Manufacturer: Lineage Power
• Series: QWr
• Type: Isolated with Remote On/Offr

Specifications of QW075A1

• Output: 5V
• Number Of Outputs: 1
• Power (watts): 75W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 5 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: 75W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 84%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

QW050B1 and QW075B1 Power Modules; dc-dc Converters:
36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Thermal Considerations
Heat Transfer Without Heat Sinks
Figure 22. 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 19. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
urations and heights, in Figure 23 and Figure 24.
Longitudinal orientation is defined as the long axis of
the module that is parallel to the airflow 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.
12
12
θ
20
15
10
ca
5
0
0
=
10
No Heat Sink; Either Orientation
LOCAL AMBIENT TEMPERATURE, T
ΔT
---------------------
P
20
C max
,
D
30
=
40
(
----------------------- -
T
D
50
C
):
P
–
D
C, max
T
60
A
(continued)
)
) divided by the
70
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.)
80
CONVECTION
A
(continued)
(°C)
NATURAL
C
90 100
) is
8-2306 (F).b
Figure 23. Case-to-Ambient Thermal Resistance
Figure 24. Case-to-Ambient Thermal Resistance
11
10
11
10
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
CONV
CONV
NAT
NAT
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
Lineage Power
Data Sheet
April 2008
(500)
(500)
2.5
2.5
8-2107 (F)
8-2108 (F)
(600)
(600)
3.0
3.0