PCB Thermal Analysis
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Posted by rickman on January 31, 2008, 12:27 pm
Please log in for more thread options analysis. I am pretty confident that I can get by with a first order analysis since I only want to know if I have a prayer of a chance of dissipating the heat from this board, rather than a detailed analysis of the range of temperatures across the board. I was thinking about drawing a simple spice circuit with current to represent heat, resistors to represent thermal resistance and voltage to represent temperature. Sounds pretty simple, right? But even after doing some web searching, I have no idea where to find details on the thermal conductivity of PCB material and the values to use for transmitting heat from the board to the air. I am surprised that this is not commonly used, but it appears that most IC data just *assumes* that your board is large enough that it is a good heatsink. I did not find a single reference with info on the PCB. Am I not looking hard enough? Can anyone point me to the raw data on PCB thermal characteristics I need for this analysis? | |||||||||||||
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Posted by Leon on February 1, 2008, 12:22 pm
Please log in for more thread options You could try asking a manufacturer of PCB laminate, I'd have thought that it would be a fairly common request and they should have the figures. The PCB software I use (Pulsonix) has an interface for the Betasoft thermal analysis program, which presumably includes modeling for the PCB material. You might be able to find something relevant on the Betasoft web site. Leon | |||||||||||||
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Posted by EE123 on February 7, 2008, 4:19 pm
Please log in for more thread options > I have a very small board that I would like to model for thermal
> analysis. =A0I am pretty confident that I can get by with a first order > analysis since I only want to know if I have a prayer of a chance of > dissipating the heat from this board, rather than a detailed analysis > of the range of temperatures across the board. =A0I was thinking about > drawing a simple spice circuit with current to represent heat, > resistors to represent thermal resistance and voltage to represent > temperature. > > Sounds pretty simple, right? =A0But even after doing some web searching, > I have no idea where to find details on the thermal conductivity of > PCB material and the values to use for transmitting heat from the > board to the air. =A0I am surprised that this is not commonly used, but > it appears that most IC data just *assumes* that your board is large > enough that it is a good heatsink. =A0I did not find a single reference > with info on the PCB. > > Am I not looking hard enough? =A0Can anyone point me to the raw data on > PCB thermal characteristics I need for this analysis? There is a book: "The Electronics of Radio" by David Rutledge of Caltech. There is a section in there deaking with thermal analysis. Dave | |||||||||||||
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> analysis. I am pretty confident that I can get by with a first order
> analysis since I only want to know if I have a prayer of a chance of
> dissipating the heat from this board, rather than a detailed analysis
> of the range of temperatures across the board. I was thinking about
> drawing a simple spice circuit with current to represent heat,
> resistors to represent thermal resistance and voltage to represent
> temperature.
>
> Sounds pretty simple, right? But even after doing some web searching,
> I have no idea where to find details on the thermal conductivity of
> PCB material and the values to use for transmitting heat from the
> board to the air. I am surprised that this is not commonly used, but
> it appears that most IC data just *assumes* that your board is large
> enough that it is a good heatsink. I did not find a single reference
> with info on the PCB.
>
> Am I not looking hard enough? Can anyone point me to the raw data on
> PCB thermal characteristics I need for this analysis?