QW050F1 Lineage Power, QW050F1 Datasheet - Page 12

• Manufacturer Part Number: QW050F1
• Description: CONVERTER DC/DC 3.3V 33W OUT
• Manufacturer: Lineage Power
• Series: QWr
• Type: Isolated with Remote On/Offr

Specifications of QW050F1

• Output: 3.3V
• Number Of Outputs: 1
• Power (watts): 33W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 8-DIP Module
• 1st Output: 3.3 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: 33W
• 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: -

dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 50 W
Thermal Considerations
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 25 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (T
through 4 m/s (800 ft./min.).
Note that the natural convection condition was mea-
sured at 0.05 m/s to 0.1 m/s (10 ft./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 dissipat-
ing components in the system. The use of Figure 25 is
shown in the following example.
Example
What is the minimum airflow necessary for a QW050F1
operating at V
maximum ambient temperature of 40 °C?
Solution
Given: V
Determine P
Determine airflow (v) (Use Figure 25.):
Note: Pending improvement will lower the power dissi-
12
12
pation and reduce the airflow needed.
I
T
P
v = 1.1 m/s (220 ft./min.)
O
A
I
D
= 54 V
= 10 A
= 40 °C
= 8.8 W
D
I
(Use Figure 23.):
= 54 V, an output current of 10 A, and a
A
) for natural convection
(continued)
Note: Pending improvement will lower the power dissipation.
Figure 23. QW050F1 Power Dissipation vs.
Note: Pending improvement will lower the power dissipation.
Figure 24. QW075F1 Power Dissipation vs.
14
12
10
10
9
8
7
6
5
4
3
2
8
6
4
2
1
1
2
2
Output Current at Room Temperature
Output Current at Room Temperature
3
4
3
OUTPUT CURRENT, I
OUTPUT CURRENT, I
5
4
6
7
5
8
6
9
10 11 12 13 14
O
O
7
(A)
(A)
Lineage Power
SEE NOTE
SEE NOTE
April 2008
8
V
V
V
V
V
V
I
I
I
I
I
I
= 36 V
= 48 V
= 75 V
= 36 V
= 54 V
= 75 V
9
8-2967 (F)
8-2968 (F)
10
15