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  • 參數(shù)資料
    型號: MPC8541VTAPF
    廠商: Freescale Semiconductor
    文件頁數(shù): 70/88頁
    文件大?。?/td> 0K
    描述: IC MPU POWERQUICC III 783-FCPBGA
    產(chǎn)品培訓(xùn)模塊: MPC8544E PowerQUICC™ III
    標(biāo)準(zhǔn)包裝: 36
    系列: MPC85xx
    處理器類型: 32-位 MPC85xx PowerQUICC III
    速度: 833MHz
    電壓: 1.2V
    安裝類型: 表面貼裝
    封裝/外殼: 783-BBGA,F(xiàn)CBGA
    供應(yīng)商設(shè)備封裝: 783-FCPBGA(29x29)
    包裝: 托盤
    配用: CWH-PPC-8540N-VE-ND - KIT EVAL SYSTEM MPC8540
    MPC8541E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 4.2
    72
    Freescale Semiconductor
    Thermal
    Chanhassen, MN 55317
    Internet: www.bergquistcompany.com
    Thermagon Inc.
    888-246-9050
    4707 Detroit Ave.
    Cleveland, OH 44102
    Internet: www.thermagon.com
    16.2.4
    Heat Sink Selection Examples
    The following section provides a heat sink selection example using one of the commercially available heat
    sinks.
    16.2.4.1
    Case 1
    For preliminary heat sink sizing, the die-junction temperature can be expressed as follows:
    TJ = TI + TR + (θJC + θINT + θSA) × PD
    where
    TJ is the die-junction temperature
    TI 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. See Table 4 and Table 5.
    During operation the die-junction temperatures (TJ) should be maintained within the range specified in
    Table 2. The temperature of air cooling the component greatly depends on 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 some thermal interface material (θ
    INT) may be about 1°C/W. For the
    purposes of this example, the
    θJC value given in Table 49 that includes the thermal grease interface and is
    documented in note 4 is used. If a thermal pad is used,
    θINT must be added.
    Assuming a TI of 30°C, a TR of 5°C, a FC-PBGA package θJC = 0.96, and a power consumption (PD) of
    8.0 W, the following expression for TJ is obtained:
    Die-junction temperature: TJ = 30°C + 5°C + (0.96°C/W + θSA) × 8.0 W
    The heat sink-to-ambient thermal resistance (
    θSA) versus airflow velocity for a Thermalloy heat sink
    #2328B is shown in Figure 46.
    Assuming an air velocity of 2 m/s, we have an effective
    θSA+ of about 3.3°C/W, thus
    TJ = 30°C + 5°C + (0.96°C/W + 3.3°C/W) × 8.0 W,
    resulting in a die-junction temperature of approximately 69°C which is well within the maximum
    operating temperature of the component.
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