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 `thermal`, 191.6 min of AI time since the prompt (692.7 min on the wall clock). This page updates at every step change.+**Running**: step `current`, 196.3 min of AI time since the prompt (697.4 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) | 191.6 | 501 | the first prompt |-| **all** | | | **191.6** | | |+| 1 | 2026-09-29T00:39:00Z | (open) | 196.3 | 501 | the first prompt |+| **all** | | | **196.3** | | |  ## Per step @@ -21,21 +21,22 @@ 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 | 55.4 | 0.0 | 55.4 | 4 | 1 | 1 | 0.0 min |-| pours | 6.1 | 0.0 | 6.1 | 26 | 2 | 1 | 0.0 min |-| current | 0.0 | 0.0 | 0.0 | 2 | 0 | 0 | 0.0 min |-| thermal | 0.0 | 0.0 | 0.0 | 1 | 1 | 0 | 0.0 min |+| routing | 59.2 | 0.0 | 59.2 | 4 | 1 | 1 | 0.0 min |+| pours | 6.1 | 0.0 | 6.1 | 27 | 2 | 1 | 0.0 min |+| current | 0.0 | 0.0 | 0.0 | 3 | 1 | 0 | 0.0 min |+| thermal | 0.9 | 0.0 | 0.9 | 7 | 1 | 0 | 0.0 min | | components | 4.5 | 4.4 | 0.1 | 2 | 1 | 0 | 4.4 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 | | other | 0.0 | 0.0 | 0.0 | 1 | 0 | 0 | 0.0 min |-| **total** | **191.6** | **114.6** | **77.0** | | | | |+| **total** | **196.3** | **114.6** | **81.7** | | | | |  ## Returns to earlier steps  - 2026-09-29T11:32:58Z back to **routing** (visit 1): Fields: the VOUT Kelvin sense runs 10 mm on B.Cu under the input caps (y=86.4), slicing the GND plane under the hot loop; re-route it along the top edge - 2026-09-29T11:55:27Z back to **pours** (visit 2): Fields: SW neck 215 A/mm2 at U1.2; U1 +51 C still air because Kelvin keepouts fenced U1.1 off the GND pour and there were no thermal vias; add an SW patch, solid GND and thermal vias at U1.1, keepouts on the sense layer only - 2026-09-29T11:56:48Z back to **pours** (visit 2): Fields: SW neck 215 A/mm2 at U1.2; U1 +51 C still air (Kelvin keepouts fenced U1.1 off the GND pour, no thermal vias); add SW patch, solid GND + thermal vias at U1.1, keepouts on the sense layer only+- 2026-09-29T12:12:12Z back to **pours** (visit 3): analyze current: SW 60 A/mm2 at the patch throat (0.95 mm) next to U1.2; open the polygon right after the pad  ## Decisions along the way @@ -46,10 +47,10 @@ AI time only, the idle cut out. - 2026-09-29T11:33:00Z clip-start:routing-1 - 2026-09-29T11:56:50Z clip-start:pours-2 - 2026-09-29T12:11:39Z clip-start:thermal-1+- 2026-09-29T12:16:21Z clip-start:current-1  ## Where the board stands -- analyze-current: fail  ## The steps on camera @@ -131,13 +132,27 @@ What this step does: copper and vias at every hot tab against the rise budget; t  ![the board when thermal began](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-thermal-1-start.png) +**Screenshot: the board when thermal ended.**++![the board when thermal ended](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-thermal-1-end.png)++### current++What this step does: IPC-2221 on every loaded net, pour and via capacity, the same-layer rule; then the AI's own current density drawing and a walkthrough of the pours it judged++**Clip: current, still recording (started 2026-09-29T12:16:21Z); it appears here when the step ends.**++**Screenshot: the board when current began.**++![the board when current began](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-current-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.  | Provider | Limit | At start | At end | Used by this run | |---|---|---|---|---|-| claude | 5h | 4 % | 4 % | 0.0 % |+| claude | 5h | 4 % | 5 % | 1.0 % | | claude | Fable | 0 % | 0 % | 0.0 % | | claude | week | 7 % | 10 % | 3.0 % | | codex | week | 2 % | 4 % | 2.0 % |