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参数资料
| 型号： | FC250R1 |
| 厂商： | LINEAGE POWER LLC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 252 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | MODULE-20 |
| 文件页数： | 4/20页 |
| 文件大小： | 583K |
| 代理商： | FC250R1 |
12
Lineage Power
Data Sheet
April 2008
dc-dc Converter; 18 Vdc to 36 Vdc Input, 28 Vdc Output; 250 W
FC250R Power Module:
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks
Derating curves for forced-air cooling without a heat
be used to determine the appropriate airow for a given
set of operating conditions. For example, if the unit with
airow along its length dissipates 20 W of heat, the
correct airow in a 40 °C environment is 1.0 m/s
(200 ft./min.).
8-1315 (C)
Figure 19. Convection Power Derating with No Heat
Sink; Airow Along Width (Transverse)
8-1314 (C)
Figure 20. Convection Power Derating with No Heat
Sink; Airow Along Length
(Longitudinal)
Heat Transfer With Heat Sinks
The power modules have through-threaded, M3 x 0.5
mounting holes, which enable heat sinks or cold plates
to be attached to the module. The mounting torque
must not exceed 0.56 N-m (5 in.-lb.). For a screw
attachment from the pin side, the recommended hole
size on the customer’s PWB around the mounting
holes is 0.130 ± 0.005 inches. If a larger hole is used,
the mounting torque from the pin side must not exceed
0.25 N-m (2.2 in.-lbs.).
Thermal derating with heat sinks is expressed by using
the overall thermal resistance of the module. Total mod-
ule thermal resistance (
θca) is dened as the maximum
case temperature rise (
TC, max) divided by the module
power dissipation (PD):
The location to measure case temperature (TC) is
shown in Figure 18. Case-to-ambient thermal resis-
tance vs. airow for various heat sink congurations is
shown in Figure 21 and Figure 22. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
8-1321 (C)
Figure 21. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
0
10
203040
100
0
40
60
70
LOCAL AMBIENT TEMPERATURE, TA (
°C)
POWER
DISSIPATION,
P
D
(W)
30
20
10
90
80
70
60
50
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
10
203040
100
0
40
60
70
LOCAL AMBIENT TEMPERATURE, TA (
°C)
POWER
DISSIPATION,
P
D
(W)
30
20
10
90
80
70
60
50
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.)
50
0.1 m/s (20 ft./min.) NAT. CONV.
θca
TC max
,
PD
---------------------
TC
TA
–
()
PD
------------------------
==
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
AIR VELOCITY, m/s (ft./min.)
0
0.0
0.5
3.0
3.5
4.0
4.5
2.5
2.0
1.0
1 1/2 in. HEAT SINK
1 in. HEAT SINK
1/2 in. HEAT SINK
1/4 in. HEAT SINK
NO HEAT SINK
1.5
CASE-TO-AMBIENT
THERMAL
RESISTANCE,
R
CA
(
°C/W)
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