PCB Design — question 5 of 10
Write a real answer. It is graded against the question's rubric, and the mastery movement is computed by the same engine the product uses. Scoring here is deterministic rather than model-written, so this page costs nothing to run and nothing is saved. In a track built from your own posting, the same rubric is graded by the model, which is what produces feedback about your reasoning rather than about coverage.
Assume the via and pad geometry is otherwise standard, and you're deciding a layout detail before routing the power stage.
A buck regulator on your board needs to deliver 3A from its output pad down through vias to a power plane on an inner layer. Using a common rule of thumb that a standard 0.3mm (12 mil) finished-hole via can safely carry roughly 1A with an acceptable temperature rise on a typical 2oz board, how many vias would you place in parallel, and why would you not just use the bare minimum number?
This one resolves to a number. Give the value in the field below and your reasoning in the box — the number is checked exactly, by arithmetic.