參數(shù)資料
型號(hào): MPC8560PXAPFB
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 32-BIT, 833 MHz, RISC PROCESSOR, PBGA783
封裝: 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, FLIP CHIP, PLASTIC, BGA-783
文件頁(yè)數(shù): 99/108頁(yè)
文件大?。?/td> 2170K
代理商: MPC8560PXAPFB
MPC8560 Integrated Processor Hardware Specifications, Rev. 3.1
90
Freescale Semiconductor
Thermal
16.2.2 Internal Package Conduction Resistance
For the packaging technology, shown in Table 59, the intrinsic internal conduction thermal resistance paths are as
follows:
The die junction-to-case thermal resistance
The die junction-to-board thermal resistance
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 Adhesives and 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.
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)
相關(guān)PDF資料
PDF描述
MPC8560PXAPDB 32-BIT, 833 MHz, RISC PROCESSOR, PBGA783
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MPC8560CPXALFB 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
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