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參數(shù)資料
| 型號： | QW050F41 |
| 廠商： | LINEAGE POWER LLC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 534K |
| 代理商： | QW050F41 |
Lineage Power
13
Data Sheet
April 2008
dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 50 W
QW050F1 and QW075F1 Power Modules:
Thermal Considerations (continued)
Heat Transfer Without Heat Sinks
(continued)
8-2306 (C).a
Figure 25. Forced Convection Power Derating with
No Heat Sink; Either Orientation
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 attach 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
module thermal resistance (
θca) is defined as the max-
imum case temperature rise (
ΔTC, max) divided by the
module power dissipation (PD):
The location to measure case temperature (TC) is
shown in Figure 22. Case-to-ambient thermal resis-
tance vs. airflow is shown, for various heat sink config-
Longitudinal orientation is defined as the long axis of
the module that is parallel to the airflow direction,
whereas in the transverse orientation, the long axis is
perpendicular to the airflow. These curves were
obtained by experimental testing of heat sinks, which
are offered in the product catalog.
8-2107 (C)
Figure 26. Case-to-Ambient Thermal Resistance
Curves; Transverse Orientation
8-2108 (C)
Figure 27. Case-to-Ambient Thermal Resistance
Curves; Longitudinal Orientation
10
20
30
40
50
60
0
10
LOCAL AMBIENT TEMPERATURE, TA (C)
5
20
100
0
15
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.)
NATURAL CONVECTION
PO
WER
DISSIP
A
TION,
P
D(W)
70
80
90
θca
ΔTCmax
,
PD
---------------------
TC TA
–
()
PD
------------------------
==
0.5
(100)
1.5
(300)
2.0
(400)
2.5
(500)
3.0
(600)
NAT
CONV
1.0
(200)
0
9
7
6
8
11
10
5
4
3
2
1
RESIST
ANCE,
θ
CA
(C/W)
CASE-T
O-AMBIENT
THERMAL
1 IN. HEAT SINK
1/2 IN. HEAT SINK
NO HEAT SINK
1/4 IN. HEAT SINK
AIR VELOCITY, m/s (ft./min.)
0.5
(100)
1.0
(200)
1.5
(300)
2.0
(400)
2.5
(500)
0
9
AIR VELOCITY, m/s (ft./min.)
7
6
8
11
3.0
(600)
NAT
CONV
10
5
4
3
2
1
1 IN. HEAT SINK
1/2 IN. HEAT SINK
NO HEAT SINK
1/4 IN. HEAT SINK
RESIST
ANCE,
θ
CA
(C/W)
CASE-T
O-AMBIENT
THERMAL
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