X7.714� �yB_Q1+Q2=Q Q5+Q3=Q1 Q3+Q2=Q4 Q5+Q4=Qcheck Q=50 Q1=(TD-T1)/R1 {Q going down} Q2=(TD-T2)/R2 {Q going up} Q5=(T1-Ta)/R5 {Q out through the PCB} Q3=(T1-T2)/R3 {Q for the shunt. If you end up with a negative value of Q, you will know that your sign is wrong here and that Q is going to opposite direction of what you assumed.} Q4=(T2-Ta)/R4 {Q out through heat sink} R1=0.39 {for underfill and bumps} R3=0.034+9.375 {adhesive and support ring} R4=0.1+0.5{interface and heat sink} R5=0.12+0.6+1.333+2.8{substrate, pins, pcb, pcb-air} R2=0.015+0.148+0.013{die, die-attach and spreader/lid} Ta=40 {Note that in this case, similar amounts of heat go up through the heat sink as go down through the PCB because R1+R5 is close to R2+R4. Q3 is small because of the high resistance of hte support ring. The ratio of R for the heat sink to the PCB-air will typically be much smaller, which will result in a much greater percentage of the heat passing through the heat sink. See what happens, for example, if you set R for the PCB-air equal to 10. }{$ID$ #91: Educational version distributed by McGraw-Hill}(,h�T5���?�il��7��?���6A_p��?d��?OpD��hȧ��OpD��hȧ�s��� �����?OpD��hȧ��OpD��hȧ�s�(�2�U@��?OpD��hȧ��OpD��hȧ�s">?>j=|��?OpD��hȧ��OpD��hȧ�s�|���h�� ��?OpD��hȧ��OpD��hȧ�sr;� @�Xp��?OpD��hȧ��OpD��hȧ�s��1�6� [���?OpD��hȧ��OpD��hȧ�s1��]������?OpD��hȧ��OpD��hȧ�sM �t �� �� ���?OpD��hȧ��OpD��hȧ�s� � k� �� ���?OpD��hȧ��OpD��hȧ�s� � � � � � � ���?OpD��hȧ��OpD��hȧ�sf *o |� �� %��?OpD��hȧ��OpD��hȧ�srB�T�g9��?OpD��hȧ��OpD��hȧ�s�����1���?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�s��?OpD��hȧ��OpD��hȧ�sQ1l-Q1xz� �U�@��?OpD��hȧ��OpD��hȧ�s-�Q2,Q2xzH� ^U�@��?OpD��hȧ��OpD��hȧ�s-�Q�*Qxz�@��?OpD��hȧ��OpD��hȧ�s���Q5,'Q5xz`a�����@��?OpD��hȧ��OpD��hȧ�s-�Q3�%Q3xz�]ӄ��?��?OpD��hȧ��OpD��hȧ�s-�Q4"Q4xz{ i�@��?OpD��hȧ��OpD��hȧ�s-�T1�T1xz��8���@��?OpD��hȧ��OpD��hȧ�s�Ta@TAxz�@��?OpD��hȧ��OpD��hȧ�s���R5�R5xz����K�@��?OpD��hȧ��OpD��hȧ�s���T2 T2xz0��R�@��?OpD��hȧ��OpD��hȧ�s �R3�R3xz(��C��@��?OpD��hȧ��OpD��hȧ�s���T445T4xz<� ���?OpD��hȧ��OpD��hȧ�s�R4�3R4xz��������?��?OpD��hȧ��OpD��hȧ�s���R1|(R1xz�G�z���?��?OpD��hȧ��OpD��hȧ�s���R2�$R2xz�MbX9��?��?OpD��hȧ��OpD��hȧ�s���TD� TDxzp�j� }�@��?OpD��hȧ��OpD��hȧ�s�Qcheck������@��?OpD��hȧ��OpD��hȧ�sL� h� ��4�����,e�X���?� cd(�d�|x ((�p�(($� ((>M� ��� Calculate����������������������������������������������������������������������������������������������������������������������������;�O��n���;�O��n��? ףp= ף�?;�O��n��?#�GG�ŧ�? ColorA=000000 ColorB=FF0000 ColorC=0000FF ColorD=408000 ColorE=800080 ColorF=004080 ColorG=00FFFF ColorH=00FF00 ColorI=008080 ColorJ=FFFF80 ColorK=808080 ColorL=FF80FF ColorM=C0C0C0 ColorN=800000 ColorO=808040 ColorP=4080FF%