Icpak -Network blocks.

victoryv · June 22, 2016, 08:37

In order to find steady state junction temperatures using compact models like 2R we generally need Rjc, Rjb and power. I can find the Rjc and power data. But as Rjb is boundary condition dependent, how would you approximate the value. I don't have option to do experiment to find Rjb.

bighead · August 18, 2016, 02:48

Are you doing a heatsink solution ?? if so, a first approximation will be to limit all the heat to the case, ie Rjc <<< Rjb. This will provide a worst case scenario.

In any case, Rjc and Rjb should be used with caution in thermal modeling. They are more useful when comparing packages, but when you want to predict Tj, more details will be better.

June 22, 2016, 08:37	Icepak compact model Rjb	#1
victoryv Member Join Date: Sep 2012 Location: FL Posts: 79 Rep Power: 13	In order to find steady state junction temperatures using compact models like 2R we generally need Rjc, Rjb and power. I can find the Rjc and power data. But as Rjb is boundary condition dependent, how would you approximate the value. I don't have option to do experiment to find Rjb. Last edited by victoryv; June 29, 2016 at 15:52.

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August 18, 2016, 02:48		#2
bighead New Member Melvin. Join Date: Mar 2009 Location: Singapore Posts: 27 Rep Power: 17	Are you doing a heatsink solution ?? if so, a first approximation will be to limit all the heat to the case, ie Rjc <<< Rjb. This will provide a worst case scenario. In any case, Rjc and Rjb should be used with caution in thermal modeling. They are more useful when comparing packages, but when you want to predict Tj, more details will be better.