LW005F Lineage Power, LW005F Datasheet - Page 12

• Manufacturer Part Number: LW005F
• Description: CONVERTER DC/DC 3.3V 4W OUT
• Manufacturer: Lineage Power
• Series: LW005r
• Type: Isolated with UVLOr

Specifications of LW005F

• Output: 3.3V
• Number Of Outputs: 1
• Power (watts): 5W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: 5-DIP Module
• 1st Output: 3.3 VDC @ 1.21A
• Size / Dimension: 1.26" L x 1.00" W x 0.40" H (32mm x 25.4mm x 10.2mm)
• Power (watts) - Rated: 4W
• Operating Temperature: -40°C ~ 105°C
• Efficiency: 74%
• Approvals: CE, CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -
• Lead Free Status / Rohs Status: No

18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W
Thermal Considerations
Sufficient cooling should be provided to help ensure
reliable operation of the power module. Heat-dissipat-
ing components inside the unit are thermally coupled to
the case. Heat is removed by conduction, convection,
and radiation to the surrounding environment. Proper
cooling can be verified by measuring the case temper-
ature. The case temperature (T
at the position indicated in Figure 21.
Note: Dimensions are in millimeters and (inches). Pin locations are
Figure 21. Case Temperature Measurement
Note that the view in Figure 21 is of the surface of the
module—the pin locations shown are for reference.
The temperature at this location should not exceed a
maximum case temperature of 105 °C. The output
power of the module should not exceed the rated
power for the module as listed in the Ordering Informa-
tion table.
The LC/LW005-Series Power Modules operate at
I
0.25 ms
a typical circuit pack environment in a natural cooled
equipment rack, with other components causing airflow
through the chimney effect. In very low airflow environ-
ments, such as small enclosures, the module should
be derated approximately 10 °C at full load. Note that
these are approximations and that actual case temper-
ature measurements in the equipment rack should be
taken to verify the case temperature does not exceed
105 °C.
Heat Transfer Characteristics
Increasing airflow over the module enhances the heat
transfer via convection. Figure 22 shows the maximum
power that can be dissipated by the module without
exceeding the maximum case temperature versus local
ambient temperature (T
12
12
O
= I
O, max
for reference only.
–1
(50 ft./min.) airflow. This airflow is present in
16.0 (0.63)
in an 85 °C ambient temperature with
Location
IN
+
-
dc-dc POWER MODULE
A
) for natural convection
C
) should be measured
OUT
+
-
(0.40
10.0
8-1363(C).a
through 3.0 ms
Systems in which these power modules are used typi-
cally generate natural convection airflow rates of
0.25 ms
components in the system. Therefore, the natural con-
vection condition represents airflow rates of approxi-
mately 0.25 ms
shown in the following example.
Example
What is the minimum airflow necessary for an LW005A
operating at 75 V, an output current of 1 A, and a maxi-
mum ambient temperature of 90 °C?
Solution:
Figure 22. LC/LW005-Series Forced Convection
Given: V
Determine P
Determine airflow (Figure 22): v = 1.0 ms
(200 ft./min.)
3.0
2.5
2.0
1.5
1.0
0.5
0.0
80
–1
NATURAL CONVECTION
(50 ft./min.) due to other heat dissipating
I
Power Derating
= 75 V, I
85
D
–1
MAX AMBIENT TEMPERATURE,T
–1
TEMPERATURE
(Figure 27): P
(600 ft./min.).
(50 ft./min.). Use of Figure 22 is
MAX CASE
O
90
= 1 A (I
95
O, max
D
= 1.75 W
), T
1.0 ms -1 (200 ft/min)
1.5 ms -1 (300 ft/min)
2.0 ms -1 (400 ft/min)
3.0 ms -1 (600 ft/min)
100
A
= 90 °C
Lineage Power
A
(
April 2008
˚
–1
C)
105
8-2623(C)
110