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参数资料
| 型号： | SME5410MCZ-270 |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 64-BIT, 270 MHz, RISC PROCESSOR, XMA |
| 封装： | 130 X 100 MM, 45 MM HEIGHT MODULE |
| 文件页数： | 15/30页 |
| 文件大小： | 183K |
| 代理商： | SME5410MCZ-270 |
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SME5410MCZ-270
270 MHz CPU, 256 Kbyte E-cache, UPA, 66 MHz PCI
UltraSPARC-IIi CPU Module
July 1998
Sun Microsystems, Inc
Case Temperature Method
The relationship between case temperature and junction temperature is described in the following thermal
equation.
If Tc is known, then Tj can be calculated:
Tj = Tc + (Pd x
θjc)
There is good tracking between the case temperature and the heat sink temperature.
Heatsink Temperature Method (the preferred method)
Measuring the heat sink temperature is sometimes easier than measuring the case temperature. This method
provides accurate results for most designs. If the heatsink temperature (Ts) is known then the following ther-
mal equation can be used to estimate the junction temperature:
Tj = Ts + [Pd (
θjc + θcs)]
Airow Cooling Estimate Method
The relationship between air temperature and junction temperature is described in the following thermal
equation:
Tj = Ta + [Pd (
θjc + θcs + θsa)]
Determination of the ambient air temperature (Ta) and the “free-stream” air velocity is required in order to
apply the airow method. The section "Heatsink-to-Air Thermal Resistance" on page 23, uses the air velocity
direction relative to the heatsink orientation to nd the thermal resistance between the heat sink and air (
θsa).
Note that the airow velocity can be measured using a velocity meter. Alternatively it may be determined by
knowing the performance of the fan that is supplying the airow. Calculating the airow velocity is difcult.
It is subject to interpretation.
Note:
The Airflow Cooling Estimate method is an estimate. Use it solely when an approximate value
suffices. Accuracy can only be assured using the Case Temperature method or the Heatsink
Temperature method. Apply these methods for the greatest accuracy.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-ME6 | 制造商:Phoenix Contact 功能描述:Lock, switching, ME terminal |
| SME6.3T471M8X16LL | 制造商:Texas Instruments 功能描述:EA471-6R3M85 |
| SME6.3VB101M6X11LL | 制造商:未知厂家 制造商全称:未知厂家 功能描述:MINIATURE, GENERAL PURPOSE, SOLVENT PROOF |
| SME6.3VB102M10X12LL | 制造商:United Chemi-Con Inc 功能描述:Capacitor, Aluminium, 1mf, 6.3V, 20±% |
| SME6.3VB103M16X31LL | 功能描述:铝质电解电容器 - 带引线 10KuF 6.3V RoHS:否 制造商:Kemet 引线类型: 电容:220 uF 容差:20 % 电压额定值:25 V 工作温度范围: 端接类型:Radial 外壳直径:8 mm 外壳长度:11 mm 引线间隔:5 mm 产品:General Purpose Electrolytic Capacitors 封装:Bulk |
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