參數(shù)資料
型號: MPC8378EVRALG
廠商: Freescale Semiconductor
文件頁數(shù): 21/127頁
文件大小: 0K
描述: MPU PWRQUICC II 667MHZ 689TEPBGA
產(chǎn)品培訓模塊: MPC837x PowerQUICC II Pro Processors
視頻文件: Introduction to the MPC837x Family
標準包裝: 27
系列: MPC83xx
處理器類型: 32-位 MPC83xx PowerQUICC II Pro
速度: 667MHz
電壓: 1V
安裝類型: 表面貼裝
封裝/外殼: 689-BBGA 裸露焊盤
供應商設備封裝: 689-TEPBGA II(31x31)
包裝: 托盤
配用: MPC8377E-RDBA-ND - BOARD REF DES MPC8377 REV 2.1
MPC8377E-MDS-PB-ND - BOARD MODULAR DEV SYSTEM
MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8
Freescale Semiconductor
117
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)
RθJC is device-related and cannot be influenced by the user. The user controls the thermal environment to
change the case to ambient thermal resistance, RθCA. For instance, the user can change the size of the heat
sink, the air flow around the device, the interface material, the mounting arrangement on printed circuit
board, or change the thermal dissipation on the printed circuit board surrounding the device.
This first-cut approach overestimates the heat sink size required, since heat flow through the board is not
accounted for, which can be as much as one-third to one-half of the power generated in the package.
Accurate thermal design requires thermal modeling of the application environment using computational
fluid dynamics software which can model both the conduction cooling through the package and board and
the convection cooling due to the air moving through the application. Simplified thermal models of the
packages can be assembled using the junction-to-case and junction-to-board thermal resistances listed in
the thermal resistance table. More detailed thermal models can be made available on request.
The thermal performance of devices with heat sinks has been simulated with a few commercially available
heat sinks. The heat sink choice is determined by the application environment (temperature, air flow,
adjacent component power dissipation) and the physical space available. Because of the wide variety of
application environments, a single standard heat sink applicable to all cannot be specified.
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MPC8378EVRANDA 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PowerQUICC? II Pro Processor Hardware Specifications
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