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Registered Member #308
Joined: Sun Mar 12 2006, 03:30PM
Location: Denmark
Posts: 7
I have been looking around the Internet but apprently im not capable of finding information regarding the witdth og the nets on a printboard when taking into account the current that has to go through them. The fFact is that i am designing a board but im not sure if the nets are capable of handling the current i am operating with. How do people determine such things?
Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
The resistivity of copper is about 17 nano-ohms/metre Resistivty is R = ( rho * L ) / XSA where: rho is the resistivity (as above) L is the length of the trace in metres XSA is the cross sectional area of the conductors in metres squared
1oz copper is the standard weight for PCB traces unless specified otherwise - this is 0.035mm thick.
Knowing the above allows you to calculate the resistance of the trace. You can then calculate the voltage drop using V = I*R and the power dissipation using P = I*I*R (or the equivalent)
Calculating the temp rise of a stretch of track depends on many factors including orientation of the board (horizontal or vertical) and the rate of airflow (if any). However for a first approximation, the equations EVR provided are probably OK.
Your PCB trace should not reach above a certain temperature in it's worst case operating environment, and this temperature is dependant on the material. FR4 is the standard material for double sided PCBs and its continuous operating temperature is about 130°C
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net width as function of current.
