參數(shù)資料
型號(hào)： FW250C1
元件分類： 電源模塊
英文描述： 1-OUTPUT 250 W DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 646K
代理商： FW250C1
Tyco Electronics Corp.
13
Data Sheet
August 2000
dc-dc Converters; 36 to 75 Vdc Input, 15 Vdc Output; 250 W to 300 W
FW250C1 and FW300C1 Power Modules:
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 occurs
at the position indicated in Figure 18.
8-1303 (F).f
Note: Top view, measurements shown in millimeters and (inches).
Pin locations are for reference only.
Figure 18. Case Temperature Measurement
Location
The temperature at this location should not exceed
100 °C. The maximum case temperature can be limited
to a lower value for extremely high reliability. The output
power of the module should not exceed the rated power
for the module as listed in the Ordering Information table.
For additional information about these modules, refer to
the
Thermal Management for FC- and FW-Series 250
W—300 W Board-Mounted Power Modules Technical
Note (TN96-009EPS).
Heat Transfer Without Heat Sinks
Derating curves for forced-air cooling without a heat
sink are shown in Figures 19 and 20. These curves can
be used to determine the appropriate airflow for a given
set of operating conditions. For example, if the unit with
airflow along its length dissipates 20 W of heat, the
correct airflow in a 40 °C environment is 1.0 m/s
(200 ft./min.).
8-1315 (F)
Figure 19. Convection Power Derating with No Heat
Sink; Airflow Along Width (Transverse)
8-1314 (F)
Figure 20. Convection Power Derating with No Heat
Sink; Airflow Along Length
(Longitudinal)
CASE
SYNC IN
SYNC OUT
MEASURE CASE
TEMPERATURE HERE
ON/OFF
82.6
(3.25)
30.5
(1.20)
VI(+)
VI(–)
VO(+)
VO(–)
01020
3040
100
0
70
50
40
20
90
80
70
60
50
10
30
60
LOCAL AMBIENT TEMPERATURE, TA (
°C)
POW
E
R
D
ISS
IP
A
T
IO
N
,
P
D
(W
)
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.) NAT. CONV.
0
10203040
100
0
70
50
40
20
90
80
70
60
50
10
30
60
LOCAL AMBIENT TEMPERATURE, TA (
°C)
POWE
R
D
ISS
IP
AT
ION
,P
D
(W
)
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.) NAT. CONV.
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