參數(shù)資料
型號(hào): MPC755BPX300LX
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 300 MHz, RISC PROCESSOR, PBGA360
封裝: 25 X 25 MM, 2.77 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-360
文件頁數(shù): 39/48頁
文件大小: 1265K
代理商: MPC755BPX300LX
44
MPC755 RISC Microprocessor Hardware Specifications
System Design Information
Dow-Corning Corporation
517-496-4000
Dow-Corning Electronic Materials
PO Box 0997
Midland, MI 48686-0997
Chomerics, Inc.
617-935-4850
77 Dragon Court
Woburn, MA 01888-4850
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
1.8.9.3 Heat Sink Selection Example
This section provides a heat sink selection example using one of the commercially available heat sinks. 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 specified in
Table 3. 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 CBGA package θjc = 0.03, and a power consumption (Pd) of 5.0 W,
the following expression for Tj is obtained:
Die-junction temperature: Tj = 30°C + 5°C + (0.03°C/W + 1.0°C/W + θsa) * 5.0 W
For a Thermalloy heat sink #2328B, the heat sink-to-ambient thermal resistance (
θ
sa) versus airflow
velocity is shown in Figure 30.
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