Contents
Why should PCB tracks be as short as possible?
Using short traces that take direct paths will help reduce EMI risk from both antennas and trace proximity. A smaller antenna will always radiate or receive less than a larger antenna. Traces themselves aren’t the only things on the high speed PCB design that can radiate EMI.
How do I make my current PCB high?
As a general rule of thumb, the following are essential fundamental factors for designing a high current board.
- Trace Width.
- Copper Thickness.
- Manufacturer’s Technological Capabilities.
- Heat Produced.
- Keeping High Current Tracks Short.
- Calculating Trace Widths with appropriate Temperature Rise.
What should trace width be for high current PCB?
Traces with higher width will carry more current. Generally, it is a rule of thumb to assume a trace width of 1mm per Amp of current took for a board with standard copper thickness. As you can notice, it soon becomes unreasonable wide when a trace has to carry 10s of amps, and such a path would take up a lot of space.
What happens when a PCB carries a high current?
In other words, P= I2R. This figure ideally should be as low as possible, but even thick traces have a specific resistance, and when carrying large currents, the power loss increases significantly, and the trail heats up. Hot spots in the PCB can then lead to board warping, and layers peeling off and crack developing.
Why do high power PCBs use heavier copper?
High power PCBs typically use heavier copper in order to reduce the trace width and still allow it to carry the same amount of current. A smaller trace width takes up less space on the board and makes it less crowded.
How to calculate the conductor width of a PCB?
In this example, the conductor width (140 mils) is chosen first, and the red arrow is traced horizontally over to the desired copper weight (1 oz/sq. ft.). We then trace vertically to the desired temperature rise (10 °C), and then we trace back to the y-axis to find the corresponding current limit (~2.75 A).