In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit.
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The width of the SW node trace is critical for handling the required current supplied to the inductor. For our buck converter example, the average current delivered to the inductor is the same as the average output current (3A).
The design engineer should specify the maximum current condition, which can then be used to estimate the width of the SW node.
For our design example, assume a 4-layer PCB uses 1oz copper on the top, bottom, and inner layers . The switching regulator circuit is placed and routed on the top layer, and the ground return plane is 9.26mils below the top layer. We can use one of many available calculator tools (found in PCB CAD software, or on PCB manufacturers’ websites) to properly size the conductor for the current.