This article introduces you the reference value of PCB copper as the wire through the large current, copper foil thickness (three specifications 35um, 50um, 70um) different width download flow, the specific comparison table and PCB circuit board copper width and the amount of current flowing Size calculation formula.
The relationship between PCB copper thickness and current is shown in the following table:
*Note: When copper wire is used as a wire to pass a large current, the current carrying capacity of the copper foil width should be selected by referring to the numerical deduction of 50% in the table.
1. Whenever possible, use separate power and ground planes for power. When using the power network bus, the more meshes the better, the many nested cells are formed, and the bus should be as wide as possible to achieve equalizing current and reducing noise.
2. The wiring of the power supply should not be thick in the middle, so as to avoid excessive pressure drop on the top. The line can't be turned suddenly. The corner should be obtuse angle greater than 90°. It is best to use arc-shaped lines. The power supply has more holes than ordinary people. If conditions permit, add a filter capacitor at the via;
3. Enclose the parts that are particularly prone to noise with ground lines to prevent noise from being coupled into the voltage.
The calculation method of the copper width of the PCB circuit board and the amount of current flowing through it:
Generally, the thickness of the copper foil of the PCB board is 35um, and when the line width is 1mm, the cross-section area of ​​the line is 0.035 square millimeters, and the current density is usually 30 A/square millimeter, so that a current of 1 A can flow through the line width per mm.
The following is the IPC275-A standard calculation formula. It is related to temperature rise, copper foil thickness, and A.
I = 0.0150 (DT 0.5453) (A 0.7349) for IPC-D-275 Internal Traces
I = 0.0647(DT 0.4281)(A 0.6732) for IPC-D-275 External Traces
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