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參數(shù)資料
| 型號： | FC250R |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Power Module:dc-dc Converter; 18 Vdc to 36 Vdc Input, 28 Vdc Output; 250 W |
| 中文描述： | 電源模塊：型DC - DC轉(zhuǎn)換器，18伏到36伏直流電輸入，28伏直流輸出; 250瓦 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 1145K |
| 代理商： | FC250R |
12
Tyco Electronics Corp.
Data Sheet
May 1999
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
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 (C)
Figure 19. Convection Power Derating with No Heat
Sink; Airflow Along Width (Transverse)
8-1314 (C)
Figure 20. Convection Power Derating with No Heat
Sink; Airflow 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 (
θ
ca) is defined as the maximum
case temperature rise (
T
C, max
) divided by the module
power dissipation (P
D
):
The location to measure case temperature (T
C
) is
shown in Figure 18. Case-to-ambient thermal resis-
tance vs. airflow for various heat sink configurations 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.
Figure 21. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
0
10
20
30
40
100
0
40
60
70
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
P
D
30
20
10
90
80
70
60
50
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
20
30
40
100
0
40
60
70
LOCAL AMBIENT TEMPERATURE, T
A
(
°
C)
P
D
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.
θ
ca
T
,
D
-------P
T
C
-------P
T
A
–
(
)
D
=
=
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
C
R
C
°
C
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