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A variable output synchronous buck converter designed as a practice PCB in KiCad. Takes a USB-C input and delivers a tunable regulated output over USB-A and screw terminals.
| Parameter | Value |
|---|---|
| Input voltage (Vin) | 0.8V – 12V |
| Output voltage (Vout) | 0.8V – Vin (adjustable) |
| Max output current | 2A |
| Controller IC | AP63200WU (synchronous buck) |
| Input connector | USB-C (power only) |
| Output connector | USB-A + screw terminal |
The AP63200WU is a synchronous buck regulator. It switches an internal MOSFET at high frequency, and the inductor + output capacitors smooth that into a steady DC output.
Output voltage is set by a resistor divider on the feedback (FB) pin:
Vout = 0.8V × (1 + RV1/R1)
Turning the pot changes the divider ratio, which changes Vout. The IC regulates to keep FB at 0.8V (internal reference).
USB-C (J1) ──► VAA ──► U1 (AP63200WU) ──► L1 (2.2µH) ──► Vout
│ │
C1 C2, C3, C4, C5, RV1, R1
(10µF) (snubber, bulk caps, feedback divider)
Vout ──► USB-A (J4)
Vout ──► Screw terminal (J3)
VAA ──► Screw terminal (J2)
| File | Description |
|---|---|
buck_convertor.kicad_pro | KiCad project file |
buck_convertor.kicad_sch | Schematic |
buck_convertor.kicad_pcb | PCB layout |
buck_convertor.kicad_prl | Local project settings |
| Schematic | PCB Routing | 3D Render |
|---|---|---|
Practice / draft — not manufactured or tested. Layout is functional but not optimised for production (ground plane, thermal relief, DRC cleanup still pending).
MIT — feel free to use, fork, or build on this.
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