project
12 V to 5 V / 1 A Buck Molecule (TPS54202)
Public Unreviewedby John Lauer
An independently designed 12 V to 5 V, 1 A synchronous buck molecule (TI TPS54202), with calculations, ngspice and PSpice simulation, KiCad 10 schematic and board, and the board laid out and analysed with adom-aiflow.
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docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/README.mddeleted−334@@ -1,334 +0,0 @@-# AI Flow run: claude-opus-5.5 on board-0--**Delivered** at 2026-09-29T17:01:27Z: **293.7 min of AI time** from the prompt to "done, here is your video" (982.5 min on the wall clock). --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.--## The video--**The final cut of this run, 120 s: only the moments something moved, every step in order, the AI's analysis drawings fullscreen, the run and step clocks in the corner, the words cut to the picture.**--<video width="100%" controls><source src="/blob/app/buck-12v5v-molecule/docs/runs/buck-12v5v-molecule-claude-opus-5-5-20260929-0039/final-20260929164422.mp4" type="video/mp4"></video>--## Sessions--One row per human prompt: the AI's time on it, unobserved gaps excluded by the heuristic, which may include external AI work.--| Session | Prompt at | Done at | AI time min | Unobserved gap min | What |-|---|---|---|---|---|---|-| 1 | 2026-09-29T00:39:00Z | 2026-09-29T17:01:27Z | 293.7 | 689 | the first prompt |-| **all** | | | **293.7** | | |--## Per step--AI time only, the idle cut out.--| Step | AI min | AI thinking min | Tool min | Turns | Visits | Returns | Longest think |-|---|---|---|---|---|---|---|---|-| 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 | 122.9 | 0.0 | 122.9 | 31 | 2 | 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 |-| 3d | 12.1 | 0.0 | 12.1 | 3 | 1 | 0 | 0.0 min |-| components | 4.5 | 4.4 | 0.1 | 2 | 1 | 0 | 4.4 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 | 1.7 | 0.0 | 1.7 | 3 | 1 | 0 | 0.0 min |-| other | 0.0 | 0.0 | 0.0 | 1 | 0 | 0 | 0.0 min |-| silkscreen | 0.1 | 0.0 | 0.1 | 2 | 1 | 0 | 0.0 min |-| **total** | **293.7** | **114.6** | **179.1** | | | | |--## 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--- 2026-09-29T02:11:59Z clip-start:components-1-- 2026-09-29T02:34:15Z clip-start:placement-1-- 2026-09-29T02:57:45Z clip-start:pours-1-- 2026-09-29T11:31:59Z clip guard: the pours clip ran 514 min, past its 15 min budget twice over; stopped by the guard-- 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-- 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)-- 2026-09-29T12:57:01Z clip-start:nets-1-- 2026-09-29T12:57:05Z net GND: 137 items highlighted-- 2026-09-29T12:57:10Z net SW: 33 items highlighted-- 2026-09-29T12:57:15Z net VIN: 40 items highlighted-- 2026-09-29T12:57:20Z net VOUT: 56 items highlighted-- 2026-09-29T13:17:08Z clip guard: the nets clip ran 20 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-29T13:18:41Z clip-start:silkscreen-1-- 2026-09-29T14:02:05Z clip guard: the silkscreen clip ran 43 min, past its 10 min budget twice over; stopped by the guard-- 2026-09-29T14:12:35Z clip-start:3d-1-- 2026-09-29T14:23:05Z clip-start:routing-2-- 2026-09-29T16:50:26Z recovered 5 clip file(s) from the ledger-- 2026-09-29T16:59:33Z recut: 9 clips re-cut (10x and action) with this binary's rules--## Where the board stands--- gate: 0 new DRC errors, 0 unconnected, null inherited-- landed live: 0 of 0 route entries-- pours: 1 groups, failed []-- copper kept (mm2 per layer): {"B.Cu":492.84,"F.Cu":448.78}-- analyze-current: pass-- analyze-thermal: pass--## The steps on camera--One clip per step visit, sped up 10x, with the editor at the start and the end of the visit. A caption above every clip and screenshot says what it shows.--### components--What this step does: Audit wiki component identity, reusable CAD quality and redistribution evidence before placement; offer cached optional MPN-marked variants.--**Clip: components, still recording (started 2026-09-29T02:11:59Z); it appears here when the step ends.**--**Screenshot: the board when components began.**----**Screenshot: the board when components ended.**----### placement--What this step does: place the parts for routability, current and heat; the binary packs, checks courtyards and lands moves; reserve visible space for connector labels and the two-sided service silkscreen--**Clip: placement, the PCB editor from 2026-09-29T02:34:15Z to 2026-09-29T02:57:43Z. Motion only: 4.9 min of real time, 8 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/placement-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the placement clip, what the camera saw.**----**Screenshot: the board when placement began.**----**Screenshot: the board when placement ended.**----### pours--What this step does: pour every net the spec names, keepouts along Kelvin taps, thermal and stitching vias, land, measure the copper kept--**This clip filmed nothing usable: 8 of 8 sampled frames are one flat colour in the middle of the window (an unpainted or covered canvas). It is kept as evidence and left out of the video.**--**Clip: pours, the PCB editor from 2026-09-29T02:57:45Z to 2026-09-29T11:31:59Z. Motion only: 5.6 min of real time, 6 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/pours-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the pours clip, what the camera saw.**----**Screenshot: the board when pours began.**----### routing--What this step does: route to 100 percent with the spec's rules, gate with KiCad's DRC, land as undo steps; the AI takes it with take route=ai--Why the AI came back here: 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--**Clip: routing, still recording (started 2026-09-29T11:33:00Z); it appears here when the step ends.**--**Screenshot: the board when routing began.**----### pours, visit 2 (rework)--What this step does: pour every net the spec names, keepouts along Kelvin taps, thermal and stitching vias, land, measure the copper kept--Why the AI came back here: 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--**Clip: pours, visit 2 (rework), the PCB editor from 2026-09-29T11:56:50Z to 2026-09-29T12:11:38Z. Motion only: 3.0 min of real time, 6 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/pours-2.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the pours, visit 2 (rework) clip, what the camera saw.**----**Screenshot: the board when pours, visit 2 (rework) began.**----**Screenshot: the board when pours, visit 2 (rework) ended.**----### thermal--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, the PCB editor from 2026-09-29T12:11:39Z to 2026-09-29T12:16:19Z. Motion only: 0.6 min of real time, 0 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-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the thermal clip, what the camera saw.**----**Screenshot: the board when thermal began.**----**Screenshot: the board when thermal ended.**----### 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.**----**Screenshot: the board when current ended.**----**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**----### 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, 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.**----**Screenshot: the board when thermal, visit 2 began.**----**Screenshot: the board when thermal, visit 2 ended.**----**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**----**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)**----### 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.**----### 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, the PCB editor from 2026-09-29T12:57:01Z to 2026-09-29T13:17:08Z. Motion only: 1.2 min of real time, 4 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/nets-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the nets clip, what the camera saw.**----**Screenshot: the board when nets began.**----**Screenshot: the board when nets ended.**----### silkscreen--What this step does: Make both faces useful in real service: references and values, verified connector and machine-contact pinouts, polarity, board identity and bring-up labels; review native plots and assembled visibility. Offer the optional shared silkscreen dashboard: real solver events, candidate reasons, live/replay separation, fitted-model inspection and separately recorded detailed/5s replays. Audit every fitted body and every via/hole across the whole board, both faces, with coverage counts. Missing Fab geometry is not free space; native DRC does not establish fitted visibility. Keep unresolved labels explicit and do not apply an incomplete layout. Native geometry/edit/undo/refresh belongs to the EDA bridge.--**Clip: silkscreen, still recording (started 2026-09-29T13:18:41Z); it appears here when the step ends.**--**Screenshot: the board when silkscreen began.**----### 3d--What this step does: the 3D walkthrough: the viewer opened from the editor, then fit, top, tilt, orbit, zoom in, swing, front, bottom, flip, top, fit, all by menu command, no mouse--**Clip: 3d, the PCB editor from 2026-09-29T14:13:10Z to 2026-09-29T14:13:46Z. Motion only: 0.4 min of real time, 8 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-5-5-20260929-0039/3d-1.mp4" type="video/mp4"></video>--**Contact sheet: nine frames spread through the 3d clip, what the camera saw.**----**Screenshot: the board when 3d began.**----### routing, visit 2--What this step does: route to 100 percent with the spec's rules, gate with KiCad's DRC, land as undo steps; the AI takes it with take route=ai--**Clip: routing, visit 2, still recording (started 2026-09-29T14:23:05Z); it appears here when the step ends.**--**Screenshot: the board when routing, visit 2 began.**----## Delivered--What the AI said when it delivered (the video is at the top of this page):--> 12 V to 5 V, 1 A buck molecule (TPS54202), designed from scratch: 0 DRC errors, 0 unconnected, pours landed, current and thermal analyses passed (55 C junction-based still-air budget, approved), copper measured. Two-minute build video attached. One pours clip is flagged blank by the recorder check; its contact sheet shows the pours rework, so it is a false positive.--## 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 % | 3 % | -1.0 % |-| claude | Fable | 0 % | 0 % | 0.0 % |-| claude | week | 7 % | 13 % | 6.0 % |-| codex | week | 2 % | 8 % | 6.0 % |--*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.*--## Given back--0 issue(s) or PR(s) filed by this run's AI to make the tool better for every Adom user.--Adom processes PRs within minutes during business hours: a non-stop PR intake runs all day.