MCM温度场稳态分析.docx

1、MCM温度场稳态分析题目四：MCM温度场稳态分析多芯片组件加散热器（热沉）的冷却分析图1(a) 、图1(b) 所示分别为大功率球栅阵列MCM的截面图和俯视图，五个芯片采用倒装焊方式置于有机基板上，为了增加模块的散热能力，在芯片背面上加一热扩展面。表1所示为各材料的物理属性。模型的热边界条件为：热源为芯片的功耗，其中ASIC大芯片的功耗为2W，热流密度为106W/m3；其余的四个芯片中，三个微处理器芯片功率的功耗为，热流密度为106W/m3；存储器芯片的功耗为，热流密度为106W/m3。模型外部（热扩展面、基板、PCB）通过与空气的对流进行散热，在空气自然对流情况下，周围空气的温度为20oC，对

2、流换热系数为15W/(m2K)。表 MCM结构参数和材料属性模型组件材料尺寸（mm）导热系数（W/(mk)）芯片硅77；5582芯片凸点5Sn/95Pb77，66，Height:,Pitch:36基板Al2O3+BeO252520焊料球 , Height:,Pitch:33PCBFR45050,热介质材料导热脂Thick:1粘接剂粘接剂Thick:热扩展面铜2525390分析从而导致器件性能变化和可靠性的下降。热场分析和设计是MCM设计中一个重要的环节3。MCM器件中的热应力来自两个方面，即来自MCM模块内部和MCM模块所处的外部环境所形成的热应力，这些热应力都会影响到器件的电性能、工作频率、

3、机械强度和可靠性。随着MCM 集成度的提高和体积的缩小,尤其是对于集成了大功率芯片的MCM ,其内部具有多个热源，热源之间的热耦合作用较强，单位体积内的功耗很大，由此带来的芯片热失效和热退化现象突出。有资料表明,器件的工作温度每升高10 oC，其失效率增加1倍4。因此,准确模拟大功率MCM 模块的三维温度场分布，并分析掌握其热特性，有利于指导MCM 热设计方案的选择，对提高大功率MCM 的可靠性具有重要意义。本文针对某球栅阵列封装的大功率MCM，提出了一种简化的热学模型，并利用有限元方法,借助有限元通用程序ANSYS ,对其进行三维温度场的稳态模拟和分析。方案步骤如下：1、建模：图4-1 MC

4、M几何模型图 图4-2 MCM网格划分图2、施加载荷计算 a、初始温度及对流系数（施加于模型外表面，即与空气接触的部位） 图4-3 施加载荷后分析图 b、分析处理(温度云图)结果如下： 图4-4 温度云图 3、后处理：图4-5 热沉的芯片内部温度分布云图图4-6 芯片凸点（5Sn/98Pb）温度分布 图4-7 基板（聚酰亚胺）温度分布云图 图4-8 焊料球（37Sn/63Pb）温度分布云图图4-9 PCB(FR4)温度分布云图图4-10 热扩展面（铜）温度分布云图4 简要分析从以上的分析结果可以得出：最高温度出现在中间大芯片区域，MCM内部有源功率芯片是热源的主要贡献者，芯片产生的热量主要沿芯

5、片背面方向传递；加散热装置来对大功率MCM进行降温是一种直接有效的方式；另外，在相同条件下，合理的结构布局，如避免大功率器件过分集中不仅能降低结点温度最大值，而且能避免热集中现象，提高MCM组件的可靠性。针对球栅阵列封装的大功率MCM其内部具有多个热源、耦合作用强、内部发热量大、温度高的特点，建立其热学模型，在ANSYS平台下对其进行了稳态模拟分析；结果表明，增加外部散热装置可以大大降低MCM的温度，是对其进行降温最直接有效的一种方式；合理布局可以避免热集中现象。5 结论在MCM器件内部，热场对器件的性能和可靠性有严重的影响，热场分析是MCM设计中的重要环节。利用ANSYS软件对一球栅阵列的M

6、CM进行了模拟分析，结果表明：1) 多芯片组件中,大功率芯片为模块中热源的主要贡献者,芯片内最高温度点位于中间大芯片区域。2) MCM几种降低温度的方法：加外部散热装置是一种直接有效的对MCM进行降温方式(有散热装置的最高温度是 oC，没有散热的布局温度大概达350 oC)；在相同条件下，合理的结构布局，能降低结点温度最大值，提高MCM组件的可靠性。命令流/BATCH WPSTYLE,0/FILNAME,homework4,0 /TITLE,3D_analysis of MCM heat dissipation/PREP7 ET,1,SOLID70MPTEMP, MPTEMP,1,0 MPDA

7、TA,KXX,1,82MPTEMP, MPTEMP,1,0 MPDATA,KXX,2,36MPTEMP, MPTEMP,1,0 MPDATA,KXX,3,20MPTEMP, MPTEMP,1,0 MPDATA,KXX,4,33MPTEMP, MPTEMP,1,0 MPDATA,KXX,5, MPDATA,KYY,5, MPDATA,KZZ,5, MPTEMP, MPTEMP,1,0 MPDATA,KXX,6,1 MPTEMP, MPTEMP,1,0 MPDATA,KXX,7, MPTEMP, MPTEMP,1,0 MPDE,KXX,6 MPDATA,KXX,6,1 MPTEMP, MPTEMP

8、,1,0 MPDATA,KXX,8,390 BLOCK,0,0,0, BLOCK,0,0, BLOCK,0,0,BLOCK,0,0, VSBV, 3, 4 BLOCK,0,0, BLOCK,0,BLOCK,0,wpoff,0,0,SPH4, BLOCK,0,0,BLOCK,0,0, FLST,3,2,6,ORDE,2 FITEM,3,8 FITEM,3,-9 VSBV, 7,P51X NUMCMP,VOLU FLST,3,1,6,ORDE,1 FITEM,3,7 VGEN,13,P51X, , , , , ,0FLST,3,13,6,ORDE,2 FITEM,3,7 FITEM,3,-19 V

9、GEN,13,P51X, , , , , ,0wpoff,0,0,SPH4, BLOCK,0,0,BLOCK,0,0, FLST,3,2,6,ORDE,2 FITEM,3,177 FITEM,3,178 VSBV, 176,P51X FLST,3,1,6,ORDE,1 FITEM,3,179 VGEN,5,P51X, , , , , ,0 FLST,3,5,6,ORDE,2 FITEM,3,176 FITEM,3,-180VGEN,5,P51X, , , , , ,0 FLST,3,1,6,ORDE,1 FITEM,3,179 VGEN,2,P51X, , , , , ,0 FLST,3,1,

10、6,ORDE,1 FITEM,3,201 VGEN,6,P51X, , , , , ,0 FLST,3,6,6,ORDE,2 FITEM,3,201 FITEM,3,-206VGEN,3,P51X, , , , , ,0 FLST,3,1,6,ORDE,1 FITEM,3,179 VGEN,2,P51X, , , , , ,0 FLST,3,1,6,ORDE,1 FITEM,3,219 VGEN,6,P51X, , , , , ,0 FLST,3,6,6,ORDE,2 FITEM,3,219 FITEM,3,-224VGEN,3,P51X, , , , , ,0 BLOCK,0, BLOCK,

11、0,wpoff,0,0, BLOCK,0,0,0,BLOCK,0,0, BLOCK,0,0, WPAVE,0,0,0 CSYS,0 wpoff,0,0, BLOCK,0,0,0, BLOCK,0, FLST,3,1,6,ORDE,1 FITEM,3,243 VGEN,8,P51X, , , , , ,0 VSEL,S,LOC,Z, FINISH /SOLFINISH /PREP7 FLST,2,9,6,ORDE,2 FITEM,2,242 FITEM,2,-250VADD,P51X VSEL,S,LOC,Z, VSEL,U, , , 5 FLST,2,2,6,ORDE,2 FITEM,2,19

12、5 FITEM,2,216 VDELE,P51X, , ,1ALLSEL,ALL FLST,2,240,6,ORDE,7 FITEM,2,1 FITEM,2,-194FITEM,2,196 FITEM,2,-215FITEM,2,217 FITEM,2,-241FITEM,2,251 VGLUE,P51X VDELE, 249, , ,1VSEL,S,LOC,Z,0, CM,_Y,VOLU VSEL, , , , 250 CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 5, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL

13、,S,LOC,Z, FLST,5,169,6,ORDE,2 FITEM,5,7 FITEM,5,-175CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 4, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,S,LOC,Z, CM,_Y,VOLU VSEL, , , , 252 CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 3, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,S,LOC,Z,

14、VSEL,S,LOC,Z, FLST,5,2,6,ORDE,2 FITEM,5,195 FITEM,5,244 CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 7, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 FLST,5,2,6,ORDE,2 FITEM,5,195 FITEM,5,244 VSEL,U, , ,P51X FLST,5,59,6,ORDE,6 FITEM,5,176 FITEM,5,-194FITEM,5,196 FITEM,5,-215FITEM,5,2

15、17 FITEM,5,-236CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 2, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,S,LOC,Z, FLST,5,3,6,ORDE,2 FITEM,5,246 FITEM,5,-248CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 1, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,S,LO

16、C,Z,CM,_Y,VOLU VSEL, , , , 245 CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 8, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,U, , , 245 FLST,5,3,6,ORDE,3 FITEM,5,216 FITEM,5,242 FITEM,5,-243CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CMSEL,S,_Y CMSEL,S,_Y1 VATT, 6, , 1, 0 CMSEL,S,_Y CMDELE,_Y CMDELE,_Y1 VSEL,S

17、,LOC,Z, SMRT,6 SMRT,7 MSHAPE,1,3D MSHKEY,0FLST,5,3,6,ORDE,2 FITEM,5,246 FITEM,5,-248CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z, SMRT,8 CM,_Y,VOLU VSEL, , , , 244 CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y

18、1 CMDELE,_Y2 CM,_Y,VOLU VSEL, , , , 195 CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z, CM,_Y,VOLU VSEL, , , , 252 CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z,0, CM,_Y,VOLU VSEL, , , , 250 CM,_Y1,VOLU CHKMSH,VOL

19、U CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z, SMRT,7 FLST,5,3,6,ORDE,3 FITEM,5,216 FITEM,5,242 FITEM,5,-243CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 SMRT,8 CM,_Y,VOLU VSEL, , , , 245 CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,

20、_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z, FLST,5,2,6,ORDE,2 FITEM,5,195 FITEM,5,244 VSEL,U, , ,P51X SMRT,6 FLST,5,59,6,ORDE,6 FITEM,5,176 FITEM,5,-194FITEM,5,196 FITEM,5,-215FITEM,5,217 FITEM,5,-236CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMD

21、ELE,_Y1 CMDELE,_Y2 VSEL,S,LOC,Z, SMRT,7 FLST,5,169,6,ORDE,2 FITEM,5,7 FITEM,5,-175CM,_Y,VOLU VSEL, , , ,P51X CM,_Y1,VOLU CHKMSH,VOLU CMSEL,S,_Y VMESH,_Y1 CMDELE,_Y CMDELE,_Y1 CMDELE,_Y2 ALLSEL,ALL VSEL,S,LOC,Z,? VSEL,S,LOC,Z, ASEL,S,EXT FLST,5,65,5,ORDE,65 FITEM,5,17 FITEM,5,21 FITEM,5,30 FITEM,5,32

22、 FITEM,5,36 FITEM,5,38 FITEM,5,719 FITEM,5,723 FITEM,5,727 FITEM,5,730 FITEM,5,735 FITEM,5,739 FITEM,5,743 FITEM,5,747 FITEM,5,751 FITEM,5,755 FITEM,5,759 FITEM,5,763 FITEM,5,767 FITEM,5,771 FITEM,5,775 FITEM,5,779 FITEM,5,783 FITEM,5,787 FITEM,5,791 FITEM,5,799 FITEM,5,803 FITEM,5,807 FITEM,5,811 F

23、ITEM,5,815 FITEM,5,819 FITEM,5,823 FITEM,5,827 FITEM,5,831 FITEM,5,835 FITEM,5,839 FITEM,5,843 FITEM,5,847 FITEM,5,851 FITEM,5,855 FITEM,5,859 FITEM,5,863 FITEM,5,867 FITEM,5,871 FITEM,5,875 FITEM,5,883 FITEM,5,887 FITEM,5,891 FITEM,5,895 FITEM,5,899 FITEM,5,903 FITEM,5,907 FITEM,5,911 FITEM,5,915 F

24、ITEM,5,919 FITEM,5,923 FITEM,5,927 FITEM,5,931 FITEM,5,935 FITEM,5,939 FITEM,5,943 FITEM,5,947 FITEM,5,951 FITEM,5,955 FITEM,5,959 ASEL,U, , ,P51X FINISH /SOLFLST,2,4,5,ORDE,4 FITEM,2,15 FITEM,2,19 FITEM,2,23 FITEM,2,1066/GO SFA,P51X,1,CONV,240,240 FLST,2,8,5,ORDE,8 FITEM,2,29 FITEM,2,31 FITEM,2,33

25、FITEM,2,35 FITEM,2,37 FITEM,2,39 FITEM,2,1064FITEM,2,-1065 /GO SFA,P51X,1,CONV,250,250 VSEL,S,LOC,Z, ASEL,S,EXT WPSTYLE,1FLST,5,3,5,ORDE,3 FITEM,5,1071FITEM,5,1073FITEM,5,1075ASEL,R, , ,P51X FLST,2,1,5,ORDE,1 FITEM,2,1075/GO SFA,P51X,1,CONV,15,20 VSEL,S,LOC,Z, ASEL,S,EXT FLST,5,2,5,ORDE,2 FITEM,5,10

26、 FITEM,5,1072ASEL,R, , ,P51X FLST,2,2,5,ORDE,2 FITEM,2,10 FITEM,2,1072/GO SFA,P51X,1,CONV,15,20 VSEL,S,LOC,Z,0, ALLSEL,ALL VSEL,S,LOC,Z,0, ASEL,S,EXT FLST,5,2,5,ORDE,2 FITEM,5,3 FITEM,5,5 ASEL,U, , ,P51X ALLSEL,ALL VSEL,S,LOC,Z,.? VSEL,S,LOC,Z,0, ASEL,S,EXT FLST,5,2,5,ORDE,2 FITEM,5,3 FITEM,5,5 ASEL

27、,U, , ,P51X FLST,5,169,5,ORDE,169 FITEM,5,40 FITEM,5,44 FITEM,5,48 FITEM,5,52 FITEM,5,55 FITEM,5,60 FITEM,5,64 FITEM,5,68 FITEM,5,72 FITEM,5,76 FITEM,5,80 FITEM,5,84 FITEM,5,88 FITEM,5,92 FITEM,5,96 FITEM,5,100 FITEM,5,104 FITEM,5,108 FITEM,5,112 FITEM,5,116 FITEM,5,120 FITEM,5,124 FITEM,5,128 FITEM

28、,5,132 FITEM,5,136 FITEM,5,140 FITEM,5,144 FITEM,5,148 FITEM,5,152 FITEM,5,156 FITEM,5,160 FITEM,5,164 FITEM,5,168 FITEM,5,172 FITEM,5,176 FITEM,5,180 FITEM,5,184 FITEM,5,188 FITEM,5,192 FITEM,5,196 FITEM,5,200 FITEM,5,204 FITEM,5,208 FITEM,5,212 FITEM,5,216 FITEM,5,220 FITEM,5,224 FITEM,5,228 FITEM,5,232 FITEM,5,236 FITEM,5,240 FITEM,5,244 FITEM,5,248 FITEM,5,252 FITEM,5,25