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  • 參數(shù)資料
    型號: MPC8544EVTARFB
    廠商: FREESCALE SEMICONDUCTOR INC
    元件分類: 微控制器/微處理器
    英文描述: 32-BIT, 1067 MHz, RISC PROCESSOR, PBGA783
    封裝: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
    文件頁數(shù): 6/120頁
    文件大?。?/td> 1321K
    代理商: MPC8544EVTARFB
    MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
    Freescale Semiconductor
    103
    Thermal
    Figure 62. Package with Heat Sink Mounted to a Printed-Circuit Board
    The heat sink removes most of the heat from the device. Heat generated on the active side of the chip is
    conducted through the silicon and through the heat sink attach material (or thermal interface material), and
    finally to the heat sink. The junction-to-case thermal resistance is low enough that the heat sink attach
    material and heat sink thermal resistance are the dominant terms.
    20.3.2
    Thermal Interface Materials
    A thermal interface material is required at the package-to-heat sink interface to minimize the thermal
    contact resistance. For those applications where the heat sink is attached by spring clip mechanism,
    Figure 63 shows the thermal performance of three thin-sheet thermal-interface materials (silicone,
    graphite/oil, floroether oil), a bare joint, and a joint with thermal grease as a function of contact pressure.
    As shown, the performance of these thermal interface materials improves with increasing contact pressure.
    The use of thermal grease significantly reduces the interface thermal resistance. The bare joint results in a
    thermal resistance approximately six times greater than the thermal grease joint.
    Heat sinks are attached to the package by means of a spring clip to holes in the printed-circuit board (see
    Figure 61). Therefore, the synthetic grease offers the best thermal performance, especially at the low
    interface pressure.
    External Resistance
    Internal Resistance
    Radiation
    Convection
    Radiation
    Convection
    Heat Sink
    Printed-Circuit Board
    Thermal Interface Material
    Package/Leads
    Die Junction
    Die/Package
    (Note the internal versus external package resistance.)
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    相關代理商/技術參數(shù)
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