FC250A1 Lineage Power, FC250A1 Datasheet - Page 10

• Manufacturer Part Number: FC250A1
• Description: CONVERTER DC/DC 2.5V 100W OUT
• Manufacturer: Lineage Power
• Series: FC250r
• Type: Isolated with Remote On/Offr

Specifications of FC250A1

• Output: 2.5V
• Number Of Outputs: 1
• Power (watts): 50W
• Mounting Type: Through Hole
• Voltage - Input: 36 ~ 75V
• Package / Case: Module
• 1st Output: 2.5 VDC @ 40A
• Size / Dimension: 2.40" L x 2.28" W x 0.50" H (61mm x 57.9mm x 12.7mm)
• Power (watts) - Rated: 100W
• Operating Temperature: -40°C ~ 100°C
• Efficiency: 85%
• Approvals: CSA, UL, VDE
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• 3rd Output: -
• 2nd Output: -
• 4th Output: -

18 Vdc to 36 Vdc Input, 5 Vdc Output; 50 W
Thermal Considerations
Introduction
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat-dissipating components inside the unit are ther-
mally coupled to the case. Heat is removed by conduc-
tion, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. Peak temperature (T
occurs at the position indicated in Figure 14.
Note: Top view, pin locations are for reference only. Measurements
Figure 14. 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.
Heat Transfer Without Heat Sinks
Increasing airflow over the module enhances the heat
transfer via convection. Figure 15 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.).
10
10
shown in millimeters and (inches).
(0.6)
15.0
Location
(0.6)
15.0
V
ON/OFF
CASE
V
I
I
(+)
(–)
A
) for natural convection
+ SEN
– SEN
V
TRIM
V
O
O
(+)
(–)
MEASURE CASE
TEMPERATURE HERE
8-716 (F).k
C
)
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 15 is
shown in the following example.
Example
What is the minimum airflow necessary for a FC250A1
operating at V
maximum ambient temperature of 60 °C?
Solution
Given: V
Determine P
Determine airflow (v) (Use Figure 15.):
Figure 15. FC250A1 Forced Convection Power
30
20
10
0
0
I
T
P
v = 1 m/s (200 ft./min.)
O
A
I
D
= 26 A
= 54 V
= 60 °C
Derating with No Heat Sink; Either
Orientation
= 10 W
10
D
LOCAL AMBIENT TEMPERATURE, T
I
(Use Figure 16.):
= 54 V, an output current of 26 A, and a
20
30
40
50
Tyco Electronics Corp.
60
3.0 m/s (600 ft./min.)
2.0 m/s (400 ft./min.)
1.0 m/s (200 ft./min.)
NATURAL
CONVECTION
70
80
July 1998
A
( C)
90 100
8-3364 (F)