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参数资料
| 型号： | 56-77-9G |
| 厂商： | Aavid Thermalloy |
| 文件页数： | 11/116页 |
| 文件大小： | 0K |
| 描述： | INSULATOR |
| 标准包装： | 1,000 |
| 材质： | 云母 |
| 其它名称： | 034816 |
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Reading a Thermal Performance Graph
The performance graphs you will see in this
catalog (see graph 579802) are actually a
579802
Air Velocity—Feet Per Minute
CONVERTING VOLUME
TO VELOCITY
composite of two separate graphs which
have been combined to save space. The small
arrows on each curve indicate to which axis
the curve corresponds. Thermal graphs are
published assuming the device to be cooled
is properly mounted and the heat sink is in
100
80
60
40
20
0
0
200
400
600 800
1000
20
16
12
8
4
0
Although most fans are normally rated and
compared at their free air delivery at zero
back pressure, this is rarely the case in most
applications. For accuracy, the volume of
output must be derated 60%–80% for
the anticipation of back pressure.
its recommended mounting position.
0
1
2 3 4
5
Heat Dissipated—Watts
EXAMPLE: The output air volume
of a fan is given as 80 CFM. The output area
GRAPH A
GRAPH B
Air Velocity—Feet Per Minute
is 6 inches by 6 inches or 36 in 2 or 25 ft 2 .
To find velocity:
100
80
0
200
400
600 800
1000
20
16
Velocity (LFM) =
Volume (CFM)
area (ft 2 )
Velocity = = 320
60
40
20
12
8
4
80
0.25
Velocity is 320 LFM, which at 80%,
0
0
1
2 3
4
5
0
derates to 256 LFM.
Heat Dissipated—Watts
GRAPH A is used to show heat sink perform-
ance when used in a natural convection envi-
ronment (i.e. without forced air). This graph
starts in the lower left hand corner with the
horizontal axis representing the heat dissipa-
tion (watts) and the vertical left hand axis
representing the rise in heat sink mounting
surface temperature above ambient (°C). By
knowing the power to be dissipated, the
temperature rise of the mounting surface
can be predicted. Thermal resistance in natu-
ral convection is determined by dividing this
temperature rise by the power input (°C/W).
EXAMPLE A: Aavid Thermalloy part number
579802 is to be used to dissipate 3 watts of
power in natural convection. Because we are
dealing with natural convection, we refer to
graph “A”. Knowing that 3 watts are to be dis-
sipated, follow the grid line to the curve and
find that at 3 watts there is a temperature
rise of 75°C. To get the thermal resistance,
divide the temperature rise by the power
dissipated, which yields 25°C/W.
* Linear feet per minute
** Cubic feet per minute
GRAPH B is used to show heat sink per-
formance when used in a forced convec-
tion environment (i.e. with forced air flow
through the heat sink). This graph has its
origin in the top right hand corner with
the horizontal axis representing air velocity
over the heat sink LFM* and the vertical
axis representing the thermal resistance of
the heat sink (°C/W). Air velocity is calculat-
ed by dividing the output volumetric flow
rate of the fan by the cross-sectional area
of the outflow air passage.
Velocity (LFM)* = Volume (CFM)**
area (ft 2 )
EXAMPLE B: For the same application
we add a fan which blows air over the heat
sink at a velocity of 400 LFM.
The addition of a fan indicates the use of
forced convection and therefore we refer
to graph “B”. This resistance of 9.50°C/W is
then multiplied by the power to be dissi-
pated, 3 watts. This yields a temperature
rise of 28.5°C.
DESIGN ASSISTANCE
Aavid Thermalloy can assist in the design
of heat sinks for both forced and natural
convection applications. Contact us for help
with your next thermal challenge. For more
information, visit our web site at:
www.aavidthermalloy.com
AMERICA
USA Tel: +1 (603) 224-9988 email: info@aavid.com
ASIA
Singapore Tel: +65 6362 8388 email: sales@aavid.com.sg
www.aavidthermalloy.com
EUROPE
Italy Tel: +39 051 764011 email: sales.it@aavid.com
United Kingdom Tel: +44 1793 401400 email: sales.uk@aavid.com
Taiwan Tel: +886(2) 2698-9888 email: sales@aavid.com.tw
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 5677A | 功能描述:测试引线 USE 565-5677B RoHS:否 制造商:Pomona Electronics 设备类型:Patch Cords 连接器类型:Banana plug (stackable) on both ends 长度:60 in 颜色:Black |
| 5677B | 功能描述:测试引线 DELUXE MULTI-USE RoHS:否 制造商:Pomona Electronics 设备类型:Patch Cords 连接器类型:Banana plug (stackable) on both ends 长度:60 in 颜色:Black |
| 5677-SL002 | 制造商:Alpha Wire 功能描述: |
| 5678 | 制造商:RAF Electronic Hardware 功能描述:SPRING, EXTENSION, 204N, 222.3MM; Body Length:222.3mm; Extended Length:54mm; Extension Load Max:204N; External Diameter:14.27mm; Wire Diameter:2.34mm ;RoHS Compliant: Yes |
| 5678 SL001 | 功能描述:多芯电缆 26AWG 7C SHIELD 1000ft SPOOL SLATE RoHS:否 制造商:Alpha Wire 导体数量:3 线规 - 美国线规（AWG）:16 绞合:19 x 29 屏蔽:Shielded 长度:100 ft 电压额定值:600 V 外壳材料:Polytetrafluoroethylene (PTFE) 绝缘材料:Polytetrafluoroethylene (PTFE) 类型:Communication and Control |
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