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

@@ -12,9 +12,9 @@ The board has not been fabricated yet. Everything below is design and simulation  Three and a half minutes, start to finish: the prompt in Adom Hydrogen, the circuit, three SPICE engines in agreement, the live layout in KiCad 10, the current and heat analysis and the rework it caused, the silkscreen placed live, the part models and their wiki pages, and what it cost to build. [How the video was made](docs/process-video.md): the clips behind each scene, the voice-over script and the tools. -<video controls preload="metadata" width="1080" poster="docs/video/buck-process-v3-poster.jpg" src="docs/video/buck-process-v3.mp4"></video>+<video controls preload="metadata" width="1080" poster="docs/video/buck-process-v4-poster.jpg" src="docs/video/buck-process-v4.mp4"></video> -[Download the 1080p copy](docs/video/buck-process-v3-1080p.mp4)+[Download the 1080p copy](docs/video/buck-process-v4-1080p.mp4)  ## Key specs 

@@ -2,9 +2,9 @@  The video on the [main page](https://wiki.adom.inc/john/buck-12v5v-molecule) tells this board's story start to finish: the prompt in Adom Hydrogen, the circuit, the three-engine simulation, the live layout in KiCad, the current and heat analysis and the rework it caused, the silkscreen, the part models, their pages on the Adom wiki, and what it cost. Every frame is real footage or a native render from this project. -- 3 min 28 s, 1080p, 30 fps, narrated from the first second to the last, with subtitles burned in so it also works muted.+- 3 min 43 s, 1080p, 30 fps, narrated from just after the logo appears to the last second, with subtitles burned in so it also works muted. - It opens and closes on the dark Adom logo sting from [adom/adom-video-brand](https://wiki.adom.inc/adom/adom-video-brand).-- [Download the 1080p copy](docs/video/buck-process-v3-1080p.mp4). The player on the main page is a 1600 px web copy.+- [Download the 1080p copy](docs/video/buck-process-v4-1080p.mp4). The player on the main page is a 1600 px web copy.  ## Scenes and the footage behind them @@ -12,21 +12,21 @@ Each scene is seen through a slow, eased camera move, and long recordings are sp  | starts at | scene | footage | |---|---|---|-| 0:00 | Logo sting | The dark Adom intro sting. The narration starts over it. |+| 0:00 | Logo sting | The dark Adom intro sting. Its sound fades out as the narration comes in, 1.8 s in. | | 0:04 | The prompt | The prompt typed into a real Claude Code thread in Adom Hydrogen, filmed with Adom Bridge's window recorder. It opens on a full shot of Hydrogen, then pushes in on the composer. |-| 0:14 | Opening | A smooth orbit of the finished molecule, rendered frame by frame from its GLB (etched parts, green D1, rounded corners). |-| 0:29 | The circuit | The cleaned-up KiCad schematic, with the Adom-style TPS54202 symbol, explored by an eased camera move. |-| 0:43 | Simulation | Our adom-spice dashboard run: ngspice in the container, then a second of the LTspice window and of PSpice for TI with the AI's cursor clicking Run, both driven through Adom Bridge, then the overlays agreeing. The two GUI shots come from the [adom-spice skillpack](https://wiki.adom.inc/adom/adom-spice-skillpack) recording of the same dashboard. Vendor run times hidden (licence). |-| 1:08 | Placement | First run, placement clip: the AI placing 24 parts in KiCad 10, at 2.3x. |-| 1:21 | Routing and pours | Rework run: the routed traces with the pours stripped back, then the pours flooding back in. |-| 1:35 | Current and heat | First run, the Adom Fields current-density and heat walkthrough, at about 7x. |-| 1:50 | The rework | First run's routing rework, then the rework run's second routing visit. |-| 2:07 | Silkscreen, placed live | Rework run, the 16-minute live silkscreen session at about 88x. |-| 2:18 | Part models | Native KiCad 10 renders of the board before and after the part-model cleanup, then a smooth close-up of D1 from its etched side. |-| 2:34 | On the Adom wiki | The live wiki pages of L1, C1, D1 and C2/C3, each scrolled from its 3D model down to its symbol and footprint (headless browser capture). |-| 2:48 | What it cost | A cost card: tokens and model calls for the board's build and rework runs, their price at Claude API rates, and the practical cost on a 20x plan. |-| 3:07 | Close | A closing card over the finished board. |-| 3:16 | Logo sting | The dark Adom outro sting, under the last line of narration. |+| 0:15 | Opening | A smooth orbit of the finished molecule, rendered frame by frame from its GLB (etched parts, green D1, rounded corners). |+| 0:30 | The circuit | The cleaned-up KiCad schematic, explored by an eased camera move. It opens by pushing in on U1, whose symbol carries the TPS54202's chip outline: adom-symbol and adom-lbr made that drawing from the part's STEP model, on Adom's OpenCascade service. |+| 0:55 | Simulation | Filmed in Adom Hydrogen: a Claude thread on the left asks for an ngspice run, and the Adom SPICE dashboard in the webview on the right runs it live, then shows all three engines' overlays agreeing. Between those, a second each of the LTspice window and of PSpice for TI with the AI's cursor clicking Run, both driven through Adom Bridge. Those two GUI shots come from the [adom-spice skillpack](https://wiki.adom.inc/adom/adom-spice-skillpack) recording of the same dashboard, since the Windows SPICE host was offline for the retake. Vendor run times hidden (licence). |+| 1:23 | Placement | First run, placement clip: the AI placing 24 parts in KiCad 10, at 2.3x. |+| 1:37 | Routing and pours | Rework run: the routed traces with the pours stripped back, then the pours flooding back in. |+| 1:50 | Current and heat | First run, the Adom Fields current-density and heat walkthrough, at about 7x. |+| 2:05 | The rework | First run's routing rework, then the rework run's second routing visit. |+| 2:22 | Silkscreen, placed live | Rework run, the 16-minute live silkscreen session at about 88x. |+| 2:33 | Part models | Native KiCad 10 renders of the board before and after the part-model cleanup, then a smooth close-up of D1 from its etched side. |+| 2:50 | On the Adom wiki | The live wiki pages of L1, C1, D1 and C2/C3, each scrolled from its 3D model down to its symbol and footprint (headless browser capture). |+| 3:03 | What it cost | A cost card: tokens and model calls for the board's build and rework runs, their price at Claude API rates, and the practical cost on a 20x plan. |+| 3:22 | Close | A closing card over the finished board. |+| 3:31 | Logo sting | The dark Adom outro sting, under the last line of narration. |  The step recordings are the ones on the [build clips](clips.md) and [rework clips](clips-rework.md) pages, taken from their raw 4K masters. @@ -52,9 +52,9 @@ Spoken by adom-tts (the Andrew voice). Part numbers and units are written out th  **Opening.** From that one prompt, Claude did the rest: the circuit math, three simulators, the layout in KiCad, the analysis, the part models and the documentation, all with Adom's tools. Here's how it went. -**The circuit.** Claude worked the circuit out from the datasheet. Every value comes from its equations: a fifteen microhenry inductor, three twenty-two microfarad output capacitors, and a sixty-eight picofarad feed-forward capacitor that shapes the loop.+**The circuit.** Claude worked the circuit out from the datasheet. The regulator's symbol carries its own chip outline: Adom Symbol and Adom L B R turned the part's STEP model into that drawing, on Adom's Open Cascade service. And every value comes from the equations: a fifteen microhenry inductor, three twenty-two microfarad output capacitors, and a sixty-eight picofarad feed-forward capacitor that shapes the loop. -**Simulation.** Before any copper, the design was simulated in three engines at once, with the Adom SPICE dashboard. N G spice runs right in the container. L T spice, and TI's P spice, run on a Windows PC, their windows driven by the AI through Adom Bridge. Start-up, both load steps, and the inductor ripple all overlay: three engines, eight measurements, all in agreement.+**Simulation.** Before any copper, the design was simulated in three engines at once, on the Adom SPICE dashboard, right in Hydrogen's webview, beside the AI that runs it. N G spice runs in the container. L T spice, and TI's P spice, run on a Windows PC, their windows driven by the AI through Adom Bridge. Start-up, both load steps, and the inductor ripple all overlay: three engines, eight measurements, all in agreement.  **Placement.** Then the board. Adom AI Flow drives KiCad ten through the Adom KiCad Bridge, live. Twenty-four parts move onto a twenty-eight by twenty millimetre molecule, with the hot loop packed tight around the regulator. 

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