Contents
Keep in mind that trace width for power is proportional to current flow — trace width increases if the current increases and vice versa. As you route your board, you should keep your signal and power routing on the top layer, and reserve the bottom layer for the return paths.
How is the routing width of a trace calculated?
The routing width of high current traces needs to be calculated for the cross-section of the trace (width and thickness) as well as the amount of current that the trace will be carrying.
Why do power traces have more current than ground traces?
Both power and ground traces will have more current flowing through them, and if you don’t make them wider than average, you’ll get a ton of heat trying to flow through those skinny spaces, which can end up burning wires and ruining your board. Check out this Arduino Mega 2560 reference design.
Which is the smallest width for power traces?
Typically, the smallest preferred width though is 5 mils. Longer traces can be routed to 5 mil widths, but wider is better to avoid the etching problems that can happen to long traces that are apart from other traces. For power traces, a good rule of thumb is to calculate them at twice their expected maximum current.
Which is the best software for power plane design?
EDA software greatly simplifies the process of designing, simulating, and testing your PCB designs for electrical, thermal, and physical performance considerations. Cadence Allegro can certainly work with you and your team to accomplish any tough circuit design.
How does a power plane provide a return path?
The normal way to provide a low impedance return path between any return current in the power plane and the ground plane is to place a decoupling/bypass capacitor between the power/ground planes.
Why are power planes important in PCB design?
It reminded me of the absolute importance that power planes maintain for PCB design. Without power, the components on your PCB might as well be inert pieces of metal.