12 V to 5 V / 1 A Buck Molecule (TPS54202)

@@ -1,6 +1,6 @@ # AI Flow run: claude-opus-5.5 on board-0 -**Running**: step `fields`, 212.0 min of AI time since the prompt (729.8 min on the wall clock). This page updates at every step change.+**Running**: step `nets`, 220.2 min of AI time since the prompt (738.0 min on the wall clock). This page updates at every step change.  Prompt at 2026-09-29T00:39:00Z (UTC). Flow: board. Every number here is from the run's append-only ledger (run.jsonl). AI time is the time the AI was working on a prompt: from the human's prompt to the AI's done, with any gap over 15 min where no command ran (unobserved, not proven idle) cut out. @@ -10,8 +10,8 @@ One row per human prompt: the AI's time on it, unobserved gaps excluded by the h  | Session | Prompt at | Done at | AI time min | Unobserved gap min | What | |---|---|---|---|---|---|-| 1 | 2026-09-29T00:39:00Z | (open) | 212.0 | 518 | the first prompt |-| **all** | | | **212.0** | | |+| 1 | 2026-09-29T00:39:00Z | (open) | 220.2 | 518 | the first prompt |+| **all** | | | **220.2** | | |  ## Per step @@ -21,16 +21,17 @@ AI time only, the idle cut out. |---|---|---|---|---|---|---|---| | intake | 92.9 | 91.9 | 1.0 | 4 | 1 | 0 | 90.9 min | | placement | 14.9 | 4.3 | 10.6 | 11 | 1 | 0 | 2.3 min |-| routing | 64.1 | 0.0 | 64.1 | 4 | 1 | 1 | 0.0 min |+| routing | 63.3 | 0.0 | 63.3 | 4 | 1 | 1 | 0.0 min | | pours | 6.1 | 0.0 | 6.1 | 27 | 2 | 1 | 0.0 min | | current | 0.1 | 0.0 | 0.1 | 6 | 1 | 0 | 0.0 min | | thermal | 11.5 | 0.0 | 11.5 | 14 | 2 | 0 | 0.0 min | | components | 4.5 | 4.4 | 0.1 | 2 | 1 | 0 | 4.4 min |-| fields | 0.0 | 0.0 | 0.0 | 1 | 1 | 0 | 0.0 min |+| fields | 9.0 | 0.0 | 9.0 | 3 | 1 | 0 | 0.0 min | | libraries | 11.4 | 8.6 | 2.9 | 1 | 1 | 0 | 8.6 min | | models | 6.3 | 5.4 | 0.9 | 3 | 1 | 0 | 5.4 min |+| nets | 0.0 | 0.0 | 0.0 | 1 | 1 | 0 | 0.0 min | | other | 0.0 | 0.0 | 0.0 | 1 | 0 | 0 | 0.0 min |-| **total** | **212.0** | **114.6** | **97.4** | | | | |+| **total** | **220.2** | **114.6** | **105.6** | | | | |  ## Returns to earlier steps @@ -53,6 +54,7 @@ AI time only, the idle cut out. - 2026-09-29T12:45:51Z artifact analysis-image for current-1: Current density on both copper layers after the rework: peak 50 A/mm² (was 215), SW now a solid patch U1 to L1 - 2026-09-29T12:45:51Z artifact analysis-image for thermal-2: Heat flow in each copper layer: U1's 0.25 W leaves through its GND pin and two thermal vias into the bottom plane - 2026-09-29T12:45:51Z artifact analysis-image for thermal-2: Temperature rise, still vs moving air: U1 +44 / +24 C, L1 +41 / +21 C; 55 C junction-based budget (area-limited board)+- 2026-09-29T12:57:01Z clip-start:nets-1  ## Where the board stands @@ -189,6 +191,28 @@ What this step does: copper and vias at every hot tab against the rise budget; t  ![Temperature rise, still vs moving air: U1 +44 / +24 C, L1 +41 / +21 C; 55 C junction-based budget (area-limited board)](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/thermal-2-analysis-image-1.png) +### fields++What this step does: the fields on the board: adom-fields solves the current density of every loaded net, the heat flow in each copper layer with the vias, and the temperature over the board; the AI reads the issues and walks the board in the app on camera++**Clip: fields, the PCB editor from 2026-09-29T12:52:31Z to 2026-09-29T12:55:52Z. Motion only: 3.3 min of real time, 141 s of it had something moving; the clock in the corner is the real elapsed time.**++<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/fields-1.mp4" type="video/mp4"></video>++**Contact sheet: nine frames spread through the fields clip, what the camera saw.**++![nine frames of fields](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/fields-1-sheet.png)++### nets++What this step does: walk the key nets on camera: each loaded, wide or Kelvin net selected as a whole so the editor highlights its pours, tracks, vias and pads together, framed with Zoom to Selection++**Clip: nets, still recording (started 2026-09-29T12:57:01Z); it appears here when the step ends.**++**Screenshot: the board when nets began.**++![the board when nets began](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-nets-1-start.png)+ ## Plan usage, the second cost line  Percent of each plan limit used, as the provider reports it, at the start of the run and at its end.@@ -198,7 +222,7 @@ Percent of each plan limit used, as the provider reports it, at the start of the | claude | 5h | 4 % | 6 % | 2.0 % | | claude | Fable | 0 % | 0 % | 0.0 % | | claude | week | 7 % | 10 % | 3.0 % |-| codex | week | 2 % | 4 % | 2.0 % |+| codex | week | 2 % | 5 % | 3.0 % |  *The limits are per account, not per run: every AI thread signed in as this user draws on the same numbers, so a run made while other threads were working shows their usage too. Read it as an upper bound unless this run was the only thread active.*