TPS54202 12 V to 5 V / 1 A Synchronous Buck Converter Molecule

@@ -0,0 +1,83 @@+# Step 19: Thermal++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++## Visits++- 2026-10-18T22:18:00Z++## What the binary checked++### analyze-thermal++- **acknowledgedPeaks**: 0 item(s)+- **boardSinkAssumptions**: 0 item(s)+- **boardSinkNotes**: 0 item(s)+- **expiredAcks**: 0 item(s)+- **fieldNote**: same-input field screen passed under its stated assumptions+- **fieldReport**: ./aiflow-run/fields/fields.json+- **heuristicPass**: False+- **pass**: False+- **results**: 2 item(s)++### thermal-vias++- **acked**: L1, U1+- **landed**: 0+- **short**: 0 item(s)++### thermal-vias-plan++- **parts**: 2 item(s)+- **plan**: ./aiflow-run/plan-thermal-vias.json+- **pourFreshness**: 0 item(s)++## Screenshots and drawings++**start**++![start](shot-thermal-1-start.png)++**Layer-by-layer copper lateral heat flux and plated via conduction from U1 (250 mW) and L1 (120 mW) into F.Cu and B.Cu pours**++![Layer-by-layer copper lateral heat flux and plated via conduction from U1 (250 mW) and L1 (120 mW) into F.Cu and B.Cu pours](artifact-7ab9cf7ae4c7fce8fdfdb4f34a506b1e94932cd1d73b5a3181a50bb1290acdaf.png)++**Full-board 3D FR4 and copper temperature rise in still air (+41.6 C peak) and moving air (+21.5 C peak) against the +55.0 C budget**++![Full-board 3D FR4 and copper temperature rise in still air (+41.6 C peak) and moving air (+21.5 C peak) against the +55.0 C budget](artifact-7069db1d811b3af9874844615dbce649b3f83e6c8b0f93ead6962db0f08fb638.png)++**screenshot**++![screenshot](shot-thermal-1-net-VOUT.png)++**screenshot**++![screenshot](shot-thermal-1-net-GND.png)++**visit 1-net-GND**++![visit 1-net-GND](shot-thermal-1-net-GND.png)++**visit 1-net-VOUT**++![visit 1-net-VOUT](shot-thermal-1-net-VOUT.png)++**visit 1-start**++![visit 1-start](shot-thermal-1-start.png)++**visit vias-1-end**++![visit vias-1-end](shot-thermal-vias-1-end.png)++**visit vias-1-start**++![visit vias-1-start](shot-thermal-vias-1-start.png)++**visit vias-2-end**++![visit vias-2-end](shot-thermal-vias-2-end.png)++**visit vias-2-start**++![visit vias-2-start](shot-thermal-vias-2-start.png)