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参数资料
| 型号： | SME5224AUPA-360 |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 64-BIT, 360 MHz, RISC PROCESSOR |
| 文件页数： | 13/28页 |
| 文件大小： | 373K |
| 代理商： | SME5224AUPA-360 |
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20
SME5224AUPA-360
360 MHz CPU, 4.0 MB E-Cache
UltraSPARC-II CPU Module
July 1999
Sun Microsystems, Inc
Temperature Estimating and Measuring Methods
The following methods can be used to estimate air cooling requirements and calculate junction temperature
based on thermocouple temperature measurements.
Airow Cooling Measurement Method
The relationship between air temperature and junction temperature is described in the following thermal
equation:
Tj =
Ta + [Pd (
θjc + θcs + θsa)]
Note: Testing is done with the worst-case power draw, software loading, and ambient air temperature.
Determination of the ambient air temperature (Ta) and the “free-stream” air velocity is required in order to
apply the airow method. The table "Heatsink-to-Air Thermal Resistance," illustrates the thermal resistance
between the heatsink 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 the interpretation of the term “free-stream.”
Note: The Airflow Cooling Estimate method is an estimate. Use it solely when an approximate value
suffices. Thermal accuracy can only be assured using the Case Temperature measuring method or
the Heatsink Temperature measuring method. Apply these methods to insure a reliable performance.
The following table, "Heatsink-to-Air Thermal Resistance," species the thermal resistance of the heatsink as
a function of the air velocity.
Air Velocity Specications
These specications are recommended for a typical conguration:
Airflow Topside
150 LFM @ 30
°C up to 2,000 feet, altitude, maximum
300 LFM @ 40
°C up to 10,000 feet, altitude, maximum
Airflow Bottomside
100 LFM @ 30
°C up to 2,000 feet, altitude, maximum
150 LFM @ 40
°C up to 10,000 feet, altitude, maximum
Heatsink-to-Air Thermal Resistance
Air Velocity
(ft/min) [1]
1. Ducted airow through the heatsinks.
150
200
300
400
500
650
800
1000
θ
SA (°C/W)
1.21
1.05
0.91
0.84
0.78
0.72
0.67
0.64
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