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`, 207.0 min of AI time since the prompt (724.8 min on the wall clock). This page updates at every step change.+**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.  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) | 207.0 | 518 | the first prompt |-| **all** | | | **207.0** | | |+| 1 | 2026-09-29T00:39:00Z | (open) | 212.0 | 518 | the first prompt |+| **all** | | | **212.0** | | |  ## Per step @@ -21,15 +21,16 @@ 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 | 69.8 | 0.0 | 69.8 | 4 | 1 | 1 | 0.0 min |+| routing | 64.1 | 0.0 | 64.1 | 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 | 0.9 | 0.0 | 0.9 | 8 | 2 | 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 | | 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** | **207.0** | **114.6** | **92.4** | | | | |+| **total** | **212.0** | **114.6** | **97.4** | | | | |  ## Returns to earlier steps @@ -49,10 +50,14 @@ AI time only, the idle cut out. - 2026-09-29T12:11:39Z clip-start:thermal-1 - 2026-09-29T12:16:21Z clip-start:current-1 - 2026-09-29T12:43:48Z clip-start:thermal-2+- 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)  ## Where the board stands  - analyze-current: pass+- analyze-thermal: pass  ## The steps on camera @@ -152,16 +157,38 @@ What this step does: IPC-2221 on every loaded net, pour and via capacity, the sa  ![the board when current ended](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-current-1-end.png) +**The AI's drawing: Current density on both copper layers after the rework: peak 50 A/mm² (was 215), SW now a solid patch U1 to L1**++![Current density on both copper layers after the rework: peak 50 A/mm² (was 215), SW now a solid patch U1 to L1](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/current-1-analysis-image-0.png)+ ### thermal, visit 2  What this step does: copper and vias at every hot tab against the rise budget; then the AI's own temperature rise drawing and a walkthrough of the pours it judged -**Clip: thermal, visit 2, still recording (started 2026-09-29T12:43:48Z); it appears here when the step ends.**+**Clip: thermal, visit 2, the PCB editor from 2026-09-29T12:43:48Z to 2026-09-29T12:47:52Z. Motion only: 2.3 min of real time, 2 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/thermal-2.mp4" type="video/mp4"></video>++**Contact sheet: nine frames spread through the thermal, visit 2 clip, what the camera saw.**++![nine frames of thermal, visit 2](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/thermal-2-sheet.png)  **Screenshot: the board when thermal, visit 2 began.**  ![the board when thermal, visit 2 began](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-thermal-2-start.png) +**Screenshot: the board when thermal, visit 2 ended.**++![the board when thermal, visit 2 ended](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/shot-thermal-2-end.png)++**The AI's drawing: Heat flow in each copper layer: U1's 0.25 W leaves through its GND pin and two thermal vias into the bottom plane**++![Heat flow in each copper layer: U1's 0.25 W leaves through its GND pin and two thermal vias into the bottom plane](/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/thermal-2-analysis-image-0.png)++**The AI's drawing: Temperature rise, still vs moving air: U1 +44 / +24 C, L1 +41 / +21 C; 55 C junction-based budget (area-limited board)**++![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)+ ## 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.