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參數(shù)資料
| 型號： | MPC603EFEX266LX |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 266 MHz, RISC PROCESSOR, CQFP240 |
| 封裝： | 32 X 32 MM, 0.50 MM PITCH, CERAMIC, QFP-240 |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 498K |
| 代理商： | MPC603EFEX266LX |
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PID6-603e Hardware Specifications, Rev 2
29
Thermagon Inc.
216-741-7659
3256 West 25th Street
Cleveland, OH 44109-1668
Loctite Corporation
860-571-5100
1001 Trout Brook Crossing
Rocky Hill, CT 06067
AI Technology (e.g. EG7655)
609-882-2332
1425 Lower Ferry Rd.
Trent, NJ 08618
The following section provides a heat sink selection example using one of the commercially available heat
sinks.
1.8.6.3 Heat Sink Selection Example
For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
Tj = Ta + Tr + (θjc + θint + θsa) * Pd
Where:
Tj is the die-junction temperature
Ta is the inlet cabinet ambient temperature
Tr is the air temperature rise within the computer cabinet
θ
jc is the junction-to-case thermal resistance
θ
int is the adhesive or interface material thermal resistance
θ
sa is the heat sink base-to-ambient thermal resistance
Pd is the power dissipated by the device
During operation the die-junction temperatures (Tj) should be maintained less than the value specied in
Table 2. The temperature of the air cooling the component greatly depends upon the ambient inlet air
temperature and the air temperature rise within the electronic cabinet. An electronic cabinet inlet-air
temperature (Ta) may range from 30 to 40 °C. The air temperature rise within a cabinet (Tr) may be in the
range of 5 to 10 °C. The thermal resistance of the thermal interface material (
θ
int) is typically about 1 °C/W.
Assuming a Ta of 30 °C, a Tr of 5 °C, a CQFP package θjc = 2.2, and a power consumption (Pd) of 4.5 watts,
the following expression for Tj is obtained:
Die-junction temperature: Tj = 30 °C + 5 °C + (2.2 °C/W + 1.0 °C/W + Rsa) * 4.5 W
For a Thermalloy heat sink #2328B, the heat sink-to-ambient thermal resistance (Rsa) versus airow
velocity is shown in Figure 17.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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