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

@@ -10,11 +10,11 @@ The board has not been fabricated yet. Everything below is design and simulation  ## The video -Under four 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.+About four 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-v5-thumb.jpg" src="docs/video/buck-process-v5.mp4"></video>+<video controls preload="metadata" width="1080" poster="docs/video/buck-process-v6-thumb.jpg" src="docs/video/buck-process-v6.mp4"></video> -[Download the 1080p copy](docs/video/buck-process-v5-1080p.mp4)+[Download the 1080p copy](docs/video/buck-process-v6-1080p.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 55 s, 1080p, 30 fps, narrated from just after the logo appears to the last second, with subtitles burned in so it also works muted.+- 4 min 0 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-v5-1080p.mp4). The player on the main page is a 1600 px web copy.+- [Download the 1080p copy](docs/video/buck-process-v6-1080p.mp4). The player on the main page is a 1600 px web copy.  ## Thumbnail @@ -20,19 +20,19 @@ Each scene is seen through a slow, eased camera move, and long recordings are sp |---|---|---| | 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. |-| 0:15 | 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 | Adom, all together | Filmed in Adom Hydrogen on a second PC: a Claude thread is asked which Adom tools built the board and answers from the wiki page, while the teal Adom AI cursor switches the webview between the board page (3D, Hero view) and the TPS54202 page (3D chip, symbol with its chip outline, footprint, the chip-outline widget), next to the EDA tools dock. |-| 3:43 | 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, copper pads, rounded corners). |+| 0:30 | The circuit | The cleaned-up KiCad schematic, explored by an eased camera move. It stops on U1, whose symbol carries the TPS54202's chip outline in its body, then on C1, L1 and D1, which keep their standard symbols with a small 3D outline beside each. adom-symbol and adom-lbr made those drawings from each part's STEP model, on Adom's OpenCascade service. |+| 1:00 | 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, LTspice and then PSpice for TI pop up over Hydrogen while their plots draw in. These two shots are composites: the LTspice and PSpice window footage comes from the [adom-spice skillpack](https://wiki.adom.inc/adom/adom-spice-skillpack) recording of the same dashboard (a Windows host driven by Adom Bridge), laid over a real Hydrogen take, because the Windows SPICE host was offline for the re-shoot. Vendor run times hidden (licence). |+| 1:28 | Placement | First run, placement clip: the AI placing 24 parts in KiCad 10, at 2.3x. |+| 1:41 | Routing and pours | Rework run: the routed traces with the pours stripped back, then the pours flooding back in. Then KiCad 10 on a second PC, driven by the Adom KiCad Bridge, selects one net at a time in the order the narration names them: GND, VIN, VOUT and the SW patch. |+| 1:55 | Current and heat | Adom Fields 0.5.0 on the first board, captured frame by frame: heat flow with the parts' own 3D models standing see-through on the board (U1 +51 °C, L1 +43 °C), then a slow fly-in to the 215 A/mm² SW neck at U1 pin 2. |+| 2:10 | The rework | First run's routing rework, then the rework run's second routing visit, then the SW neck in KiCad with a ring around it, and Adom Fields on the final board: U1 +44 °C, L1 +41 °C over their parts. |+| 2:27 | Silkscreen, placed live | Rework run, the 16-minute live silkscreen session at about 88x. |+| 2:38 | 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. |+| 2:54 | 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). |+| 3:08 | 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. |+| 3:27 | Adom, all together | Filmed in Adom Hydrogen on a second PC: a Claude thread is asked which Adom tools built the board and answers from the wiki page, while the teal Adom AI cursor switches the webview between the board page (3D, Hero view) and the TPS54202 page (3D chip, symbol with its chip outline, footprint, the chip-outline widget), next to the EDA tools dock. |+| 3:48 | 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. @@ -58,7 +58,7 @@ 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. 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.+**The circuit.** Claude worked the circuit out from the datasheet. The regulator's symbol carries its own chip outline, and the big capacitor, the inductor and the L E D show theirs beside their symbols: Adom Symbol and Adom L B R turned each 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, 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. 

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