Appliance Electronics & Control Boards worked example

Control Board Production Ramp Planner at 56% expected ramp uptime: a worked example

This worked example runs the control board production ramp planner numbers for a tougher week than the baseline: 56% expected ramp uptime instead of the typical 78%. Estimate ramp-period good board output from boards per ramp cycle, planned cycles, ramp uptime, and launch yield.

The inputs for this scenario

  • Boards completed per ramp cycle: 5 boards/cycle (held at the documented default)
  • Planned ramp production cycles: 420 cycles (held at the documented default)
  • Expected ramp uptime: 56 % (the input this scenario stresses; the baseline uses 78)
  • Expected launch good-board yield: 90 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross ramp board capacity = boards completed per ramp cycle × planned ramp production cycles.
  • Expected good boards during ramp works out to 1,058 boards at these inputs, and this is the headline figure for the scenario.
  • Gross ramp board capacity works out to 2,100 boards at these inputs.
  • Boards lost to ramp downtime works out to 924 boards at these inputs.
  • Boards lost to launch yield loss works out to 118 boards at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected ramp uptime sits at 78% and the headline result is 1,474 boards, this scenario comes in 28.21% below the baseline at 1,058 boards.
  • Use it during NPI and early production of a new control board to set realistic ramp-period volume commitments. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Expected good boards during ramp: 1,058 boards (headline result)
  • Gross ramp board capacity: 2,100 boards
  • Boards lost to ramp downtime: 924 boards
  • Boards lost to launch yield loss: 118 boards

Run it with your numbers

  • To rerun this with your own numbers, open the live Control Board Production Ramp Planner calculator, set expected ramp uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.