參數(shù)資料
型號: MPC8245LZU350D
廠商: Freescale Semiconductor
文件頁數(shù): 50/68頁
文件大?。?/td> 0K
描述: IC MPU 32BIT 350MHZ PPC 352-TBGA
標準包裝: 24
系列: MPC82xx
處理器類型: 32-位 MPC82xx PowerQUICC II
速度: 350MHz
電壓: 2V
安裝類型: 表面貼裝
封裝/外殼: 352-LBGA
供應商設備封裝: 352-TBGA(35x35)
包裝: 托盤
MPC8245 Integrated Processor Hardware Specifications, Rev. 10
54
Freescale Semiconductor
System Design
Dow-Corning Corporation
800-248-2481
Dow-Corning Electronic Materials
2200 W. Salzburg Rd.
Midland, MI 48686-0997
Internet: www.dow.com
Shin-Etsu MicroSi, Inc.
888-642-7674
10028 S. 51st St.
Phoenix, AZ 85044
Internet: www.microsi.com
The Bergquist Company
800-347-4572
18930 West 78th St.
Chanhassen, MN 55317
Internet: www.bergquistcompany.com
Thermagon Inc.
888-246-9050
4707 Detroit Ave.
Cleveland, OH 44102
Internet: www.thermagon.com
7.8.3
Heat Sink Usage
An estimation of the chip junction temperature, T
J, can be obtained from the equation:
TJ = TA + (RθJA × PD)
where
TA = ambient temperature for the package (°C)
RθJA = junction-to-ambient thermal resistance (°C/W)
PD = power dissipation in the package (W)
The junction-to-ambient thermal resistance is an industry-standard value that provides a quick and easy
estimation of thermal performance. Unfortunately, two values are in common usage: the value determined
on a single-layer board and the value obtained on a board with two planes. Which value is closer to the
application depends on the power dissipated by other components on the board. The value obtained on a
single-layer board is appropriate for the tightly packed printed-circuit board. The value obtained on the
board with the internal planes is usually appropriate if the board has low power dissipation and the
components are well separated.
When a heat sink is used, the thermal resistance is expressed as the sum of a junction-to-case thermal
resistance and a case-to-ambient thermal resistance:
RθJA = RθJC + RθCA
where
RθJA = junction-to-ambient thermal resistance (°C/W)
RθJC = junction-to-case thermal resistance (°C/W)
RθCA = case-to-ambient thermal resistance (°C/W)
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