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

@@ -77,4 +77,6 @@ Every step of the build, in order, each with its own page of evidence (checks, s  **19. Thermal**: temperature rise against the budget. [The evidence](steps/19-thermal/README.md) +**20. Fields**: current and heat solved in 3D. [The evidence](steps/20-fields/README.md)+ <!-- /aiflow:steps -->

@@ -0,0 +1,38 @@+# Step 20: Fields++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++## Visits++- 2026-10-18T22:44:57Z++## What the binary checked++### tour-fields++- **chips**: 2 item(s)+- **heat**: budgetC 55.0; jouleW 0.003; movingAirWPerM2K 25.0; peakRiseC 41.630340576171875; peakRiseMovingC 21.51791763305664; sourcesModelled 2; status parts modelled; stillAirWPerM2K 10.0+- **issues**: 6 item(s)+- **nets**: 4 item(s)++## Screenshots and drawings++**fields-start**++![fields-start](shot-fields-1-fields-start.png)++**fields-end**++![fields-end](shot-fields-1-fields-end.png)++**visit 1-fields-end**++![visit 1-fields-end](shot-fields-1-fields-end.png)++**visit 1-fields-start**++![visit 1-fields-start](shot-fields-1-fields-start.png)++## Clips++::adom-video{video="/john/tps54202-12v-5v-buck-20261018/render/docs/clips/window-7997818-20261018-224547-10x.mp4" poster="/john/tps54202-12v-5v-buck-20261018/render/docs/clips/window-7997818-20261018-224547-poster.jpg" title="Fields, visit 1 (10x)" muted="true"}