參數(shù)資料
型號： 576012B00000G
廠商： Aavid Thermalloy
文件頁數(shù)： 13/116頁
文件大?。?/td> 0K
描述： BOARD LEVEL HEAT SINK
產(chǎn)品培訓(xùn)模塊： How to Select a Heat Sink
標(biāo)準(zhǔn)包裝： 1,000
類型： 插件板級
冷卻式包裝： TO-220
固定方法： 把緊螺栓
形狀： 矩形
長度： 0.900"（22.86mm）
寬： 1.000"（25.40mm）
機座外的高度（散熱片高度）： 0.380"（9.65mm）
溫升時的功耗： 2W @ 40°C
在強制氣流下的熱敏電阻： 在 700 LFM 時為4°C/W
自然環(huán)境下的熱電阻： 20.8°C/W
材質(zhì)： 鋁
材料表面處理： 黑色陽極化處理
其它名稱： 002387
11
READING
A
T
HERMAL
PERFORMANCE
GR
APH
EUROPE
ASIA
Italy Tel: +39 051 764011 email: sales.it@aavid.com
United Kingdom Tel: +44 1793 401400 email: sales.uk@aavid.com
Singapore Tel: +65 6362 8388 email: sales@aavid.com.sg
Taiwan Tel: +886(2) 2698-9888 email: sales@aavid.com.tw
AMERICA
USA Tel: +1 (603) 224-9988 email: info@aavid.com
www.aavidthermalloy.com
The performance graphs you will see in this
catalog (see graph 579802) are actually a
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
its recommended mounting position.
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.
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.
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.
CONVERTING VOLUME
TO VELOCITY
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.
EXAMPLE: The output air volume
of a fan is given as 80 CFM. The output area
is 6 inches by 6 inches or 36 in2 or 25 ft2.
To find velocity:
80
0.25
Velocity is 320 LFM, which at 80%,
derates to 256 LFM.
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
Heat Dissipated—Watts
0
20
40
60
80
100
01
2
3
4
5
Mounting
Surface
Temp
Rise
Above
Ambient—
°
C
Air Velocity—Feet Per Minute
Thermal
Resistance
From
MTG
Surface
to
Ambient—
°
C/Watt
20
16
12
4
8
0
400
200
600
800
1000
GRAPH B
Velocity (LFM) =
Velocity =
= 320
Air Velocity—Feet Per Minute
Heat Dissipated—Watts
Thermal
Resistance
From
MTG
Surface
to
Ambient—
°
C/Watt
20
0
20
40
60
80
100
01
2
3
4
5
16
12
4
8
0
400
200
600
800
1000
Mounting
Surface
Temp
Rise
Above
Ambient—
°
C
GRAPH A
579802
Reading a Thermal Performance Graph
Velocity
(LFM)* = Volume (CFM)**
area (ft2)
* Linear feet per minute
** Cubic feet per minute
Volume (CFM)
area (ft2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
576012U00000G 制造商:Aavid Thermalloy 功能描述:HEAT SINKS MISC. - Bulk 制造商:Aavid Thermalloy 功能描述:TO-220 Package 20.80 C/W Thermal Resistance Mounting Channel Style Heat Sink
5760140 功能描述:CONN RCPT 14POS 30-22AWG SLD CUP RoHS:是 類別:連接器，互連式 >> D形，Centronics 系列:57 產(chǎn)品變化通告:52755 Series Obsolescence 19/May/2009 標(biāo)準(zhǔn)包裝:1 系列:52755 連接器類型:外罩觸點 連接器類型:插座 位置數(shù):120 行數(shù):2 安裝類型:面板安裝，通孔，直角 端子:焊接 法蘭特點:螺紋插件（M5） 類型:- 特點:板鎖，屏蔽 觸點表面涂層:金 觸點涂層厚度:30µin（0.76µm） 其它名稱:052755-1209052755-1209-E05275512090527551209-E52755-1209-E527551209527551209-EQ2711871SD-52755-001
57-60140 功能描述:I/O 連接器 RECPT. RoHS:否 制造商:Hirose Connector 產(chǎn)品:Plugs 系列:DH 端口數(shù)量: 位置/觸點數(shù)量:51 節(jié)距:1 mm 觸點電鍍: 觸點材料: 型式:Male 電流額定值:0.5 A 安裝風(fēng)格:Cable 端接類型:IDC 顏色: 安裝角:
57601400 制造商:Eaton Corporation 功能描述:TOTALIZER; RATE METER/TACHOMETER; AMBASSADOR TOTALIZER / RATE INDICATOR 115 VAC 制造商:Eaton Corporation 功能描述:MULTIFUNCTION COUNTER
57601401 制造商:Eaton Corporation 功能描述:TOTALIZER; AMBASSADOR SINGLE PRESET COUNT CONTROL WITH RATE 115VAC 制造商:Eaton Corporation 功能描述:MULTIFUNCTION COUNTER 制造商:Eaton Corporation 功能描述:MULTIFUNCTION COUNTER; No. of Digits / Alpha:8; Supply Voltage Range:115V AC, 230V AC, 10V DC to 15V DC; Power Consumption:7W; Panel Cutout Height:68.07mm; Panel Cutout Width:68.07mm; Counting Speed:40kHz; Character Size:0.3" ;RoHS Compliant: Yes
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