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參數(shù)資料
| 型號： | MPC8560VTAQFC |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 94/108頁 |
| 文件大?。?/td> | 0K |
| 描述： | MPU POWERQUICC III 783FCPBGA |
| 標(biāo)準(zhǔn)包裝： | 36 |
| 系列： | MPC85xx |
| 處理器類型： | 32-位 MPC85xx PowerQUICC III |
| 速度： | 1.0GHz |
| 電壓： | 1.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 784-BBGA，F(xiàn)CBGA |
| 供應(yīng)商設(shè)備封裝： | 783-FCPBGA（29x29） |
| 包裝： | 托盤 |
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MPC8560 Integrated Processor Hardware Specifications, Rev. 4.2
86
Freescale Semiconductor
Thermal
Figure 53 depicts the primary heat transfer path for a package with an attached heat sink mounted to a
printed-circuit board.
Figure 53. 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 lid, then 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.
16.2.3 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 54 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 51). Therefore, the synthetic grease offers the best thermal performance, especially at the low
interface pressure.
When removing the heat sink for re-work, it is preferable to slide the heat sink off slowly until the thermal
interface material loses its grip. If the support fixture around the package prevents sliding off the heat sink,
the heat sink should be slowly removed. Heating the heat sink to 40-50°C with an air gun can soften the
interface material and make the removal easier. The use of an adhesive for heat sink attach is not
recommended.
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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