4 layers28.4 × 47.9 mm
Easyduino ESP32
Hanqaqa/Easyduino
Easily dive into different PCB KiCad designs of the most popular microcontroller devboards
29 parts755CERN-OHL-P-2.0
4 layers43.5 × 21.3 mm
EMI SS Supply Electgpl
electgpl/DCDCsyncBuckFSSThis project is the design of a DC-DC buck regulator module based on the AP64501. It is mechanically and electrically compatible with the popular LM2596-based low-cost Chinese modules, using the same form factor, size…
- Size
- 43.5 × 21.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 12
- Pads
- 56
- Tracks, vias
- 40, 212
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 Sep 2025
- Updated
- 15 Jun 2026
Overview
EMI SS Supply Electgpl is an open-source printed circuit board by electgpl, from the electgpl/DCDCsyncBuckFSS repository on GitHub. It is a 4-layer board of 43.5 × 21.3 mm with 29 parts on 12 nets, routed with 40 tracks and 212 vias.
Its parts include 12 capacitors, 4 resistors, 2 inductors and 1 IC. It belongs with the power boards of this library.
README
README.mdHigh-Performance Synchronous Buck Converter Module (AP64501)
This project is the design of a DC-DC buck regulator module based on the AP64501.
It is mechanically and electrically compatible with the popular LM2596-based low-cost Chinese modules, using the same form factor, size, and pinout.
However, this design provides significant improvements in terms of efficiency, thermal performance, EMI, and reliability.
🔑 Key Features
- Synchronous buck regulator (AP64501)
- Higher efficiency compared to asynchronous regulators.
- Reduced heat generation under load.
- Fixed Spread Spectrum (FSS)
- Lower EMI and more predictable spectral content.
- Soft-Start (SS)
- Controlled inrush current during power-up.
- Protections included
- Overcurrent protection (OCP).
- Overvoltage protection (OVP).
- Thermal shutdown (TSD).
- Output filtering
- Additional LC filter stage for significantly reduced ripple.
- PCB design
- 4-layer PCB for improved heat spreading and ground integrity.
- Optimized layout for EMI and thermal performance.
- Thermal analysis
- Finite Element Analysis (FEA) performed.
- Effective thermal resistance: 55 °C/W (with 1 oz copper).
📐 Form Factor
- Pinout, size, and footprint are drop-in compatible with standard LM2596-based modules.
- This allows easy replacement in existing designs, providing an immediate upgrade without redesigning the host PCB.
📊 Performance Advantages over LM2596 Modules
- ✅ Higher efficiency → less power loss.
- ✅ Lower EMI thanks to fixed-frequency operation and optimized layout.
- ✅ Lower output ripple due to additional LC stage.
- ✅ Improved thermal performance with 4-layer PCB and synchronous design.
- ✅ Built-in protections increase reliability and robustness.
🛠 Applications
- Embedded systems.
- IoT devices.
- RF front-ends (low-ripple supply requirement).
- General-purpose regulated DC power supply.
- Replacement for LM2596 modules in existing projects.
📄 Documentation
- AP64501 Datasheet (Diodes Incorporated)
- Thermal FEA analysis results included in
/docs. - PCB design files in
/hardware.
🚀 Status
- ✅ Schematic design complete.
- ✅ PCB layout (4-layer) completed.
- ✅ Thermal simulation results validated.
- 🔜 Hardware prototyping and testing in progress.
📷 Preview
(Add photos, renderings, or thermal plots here when available.)
📜 License
This project is released under the MIT License.
See the LICENSE file for details.
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 22µF | Capacitor_SMD:C_1210_3225Metric | C9, C10, C11, C12 |
| 4 | TestPoint | TestPoint:TestPoint_THTPad_2.0x2.0mm_Drill1.0mm | TP1, TP2, TP3, TP4 |
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric | C3, C4, C8 |
| 3 | Fiducial | Fiducial:Fiducial_0.5mm_Mask1mm | FID1, FID2, FID3 |
| 2 | 10nF | Capacitor_SMD:C_0603_1608Metric | C5, C7 |
| 2 | 10µF | Capacitor_SMD:C_1206_3216Metric | C1, C2 |
| 1 | 100kΩ | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 100Ω | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 10µH | Inductor_SMD:L_Wuerth_HCM-7050 | L2 |
| 1 | 15.8kΩ | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 2.2kΩ | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 2.7nF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 3.6µH | Inductor_SMD:L_Vishay_IHLP-4040 | L1 |
| 1 | 47kΩ | Potentiometer_SMD:Potentiometer_Bourns_TC33X_Vertical | RV1 |
| 1 | AP64501SP-13 | Package_SO:Diodes_SO-8EP | U1 |
| 1 | LOGO | EXO_LIB_GIT:Recognized Component very small | G*** |
| 1 | TestPoint | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
Questions
How big is the EMI SS Supply Electgpl PCB?
It measures 43.5 × 21.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the EMI SS Supply Electgpl use?
29 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the EMI SS Supply Electgpl KiCad files?
From the electgpl/DCDCsyncBuckFSS repository on GitHub, at the commit this page was made from: the board is PCB/EMI_SS_Supply_Electgpl/EMI_SS_Supply_Electgpl.kicad_pcb and its schematic PCB/EMI_SS_Supply_Electgpl/EMI_SS_Supply_Electgpl.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the EMI SS Supply Electgpl design in my own project?
Its repository states no licence, so its author keeps all rights: ask electgpl before reusing the design.
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