JFW075A1 Lineage Power, JFW075A1 Datasheet - Page 16

• Manufacturer Part Number: JFW075A1
• Description: CONVERTER DC/DC 5V 75W OUT
• Manufacturer: Lineage Power
• Series: JFWr
• Type: Isolatedr

Specifications of JFW075A1

• Output: 5V
• Number Of Outputs: 1
• Power (watts): 75W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: Module
• 1st Output: 5 VDC @ 15A
• Size / Dimension: 2.40" L x 2.28" W x 0.50" H (61mm x 57.9mm 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: -

dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
Thermal Considerations
Introduction
The JFW-Series power modules operate in a variety of
thermal environments; however, sufficient cooling
should be provided to help ensure reliable operation of
the units. Heat-dissipating components inside the units
are thermally coupled to the case. Heat is removed by
conduction, convection, and radiation to the surround-
ing environment. Proper cooling can be verified by
measuring the case temperature. Peak temperature
(T
Note: Top view, measurements shown in millimeters and (inches).
Figure 27. Case Temperature Measurement
The temperature at this location should not exceed
100 °C. The output power of the module should not
exceed the rated power for the module as listed in the
Ordering Information table.
Although the maximum case temperature of the power
modules is 100 °C, you can limit this temperature to a
lower value for extremely high reliability.
For additional information regarding this module, refer to
the Lineage Power Thermal Management JC-, JFC-
, JW-, and JFW-Series 50 W to 150 W Board-Mounted
Power Modules Technical Note (TN97-008EPS).
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 28 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.).
16
16
7.6 (0.30)
C
) occurs at the position indicated in Figure 27.
Pin locations are for reference only.
Location
38.0 (1.50)
A
) for natural convection
TEMPERATURE HERE
MEASURE CASE
8-1397 (C).a
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 this power module may be
used typically generate a natural convection airflow
rate of 0.3 m/s (60 ft./min.) due to other heat dissipating
components in the system. The use of Figure 28 is
shown in the following example.
Example
What is the minimum airflow necessary for a JFW150A
operating at V
maximum ambient temperature of 40 °C?
Solution
Given: V
Determine P
Determine airflow(v) (Use Figure 28.):
Figure 28. Forced Convection Power Derating with
35
30
25
20
15
10
5
0
0
I
T
P
v = 2.0 m/s (400 ft./min.)
O
A
I
D
= 20 A
= 54 V
= 40 °C
= 17 W
0.1 m/s (NAT. CONV.)
10
No Heat Sink; Either Orientation
D
I
(Use Figure 32.):
LOCAL AMBIENT TEMPERATURE, T
= 54 V, an output current of 20 A, and a
20
(20 ft./min.)
30
40
50
60
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
2.0 m/s
1.5 m/s (300 ft./min
1.0 m/s (200 ft./min
0.5 m/s (100 ft./min
70
April 2008
(500 ft./min
(400 ft./min
A
80
(˚C)
Lineage Power
8-1150 (C).a
90
100