2 layers165 × 85 mm
Sprinkler System
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Isolated SMPS Based Power Module
uttkarsh-chimane/Isolated-AC-DC-SMPS-Based-Power-Module1An isolated 230VAC to 5VDC power supply using the HLK-PM01 AC-DC module with input protection, EMI filtering, and custom PCB design in KiCad 10.
- Size
- 80 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 8
- Pads
- 33
- Tracks, vias
- 65, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 9 Jul 2026
- Updated
- 25 Sep 2026
Overview
Isolated SMPS Based Power Module is an open-source printed circuit board by uttkarsh-chimane, from the uttkarsh-chimane/Isolated-AC-DC-SMPS-Based-Power-Module repository on GitHub, published under the MIT licence. It is a 2-layer board of 80 × 40 mm with 16 parts on 8 nets, routed with 65 tracks and 0 vias.
It is built around the HLK-PM01, 10D471K and 470UF 10V 6.3*7, with the SMBJ5.0A among its other parts. Its parts include 2 capacitors, 2 connectors, 2 crystals, 1 resistor and 1 diode. It belongs with the power boards of this library.
Main components
4
HLK-PM01
DIP,34x24mm0.1W 100mVp-p 15mm 20mm 34mm 3W 3kV 5V 700mA 73% 85VAC~265VAC AC-DC Short Circuit Protection、Over Current Protection、Fault self-recovery ±0.2% 插件,34x20mm AC-DC Power Modules ROHSHI-LINKAC-DC Power Modules
10D471K
插件,P=7.5mm190pF@1kHz 2.5kA 300V 385V 400mW 42.3J 423V~517V 775V 插件,P=7.5mm Varistors ROHSRUILONVaristors470UF 10V 6.3*7
插件,6.3x7mm1000hrs@105℃ 10V 2.5mm 470uF 6.3mm 7mm 插件,6.3x7mm Aluminum Electrolytic Capacitors - Leaded ROHSLCSCAluminum Electrolytic Capacitors - Leaded
SMBJ5.0A
DO-214AA(SMB)-65℃~+150℃ 5V 600W@10/1000us 65.3A@10/1000us 7V 800uA 9.2V TVS Unidirectional DO-214AA(SMB) ESD and Surge Protection (TVS/ESD) ROHSMDDESD And Surge Protection (TVS/ESD)
README
README.md⚡ Isolated AC-DC SMPS-Based Power Supply using HLK-PM01
Overview • Features • Hardware Architecture • Schematic Highlights • PCB Insights • Specifications
A compact, isolated AC-to-DC Switch Mode Power Supply (SMPS) built around the HLK-PM01 module. The design incorporates comprehensive mains input protection, EMI suppression, primary-secondary galvanic isolation, and a regulated 5V DC output, making it suitable for embedded systems, IoT devices, and industrial electronics.
📖 Overview
This project presents the design of an isolated 230VAC to 5VDC power supply using the HLK-PM01 AC-DC converter module. The objective was to develop a compact, safe, and reliable power supply suitable for powering embedded systems, microcontrollers, and IoT devices.
The design integrates the essential protection and filtering stages required for a mains-powered supply, including:
- Input overcurrent protection using a fuse
- Inrush current limiting using an NTC thermistor
- Surge protection using an MOV
- EMI suppression using X2 & Y2 safety capacitors and a bleeder resistor
- Primary-secondary galvanic isolation
- Output filtering and transient protection using electrolytic & ceramic capacitors and a TVS diode
📷 Project Gallery
🧩 3D PCB Render
🔌 PCB Layout
⚙️ Schematic
✨ Features
- 230VAC input, regulated 5V DC output (see Specifications for current rating)
- Isolated design (HLK-PM01 module)
- Fuse protection
- MOV surge protection
- NTC inrush current limiter
- X2 EMI suppression capacitor
- Y2 safety capacitor
- Bleeder resistor
- Output filtering capacitors (electrolytic + ceramic)
- TVS diode protection on the output rail
- LED power indicator
- Compact single-layer PCB
- 7.5 mm creepage/clearance barrier (basic isolation — see note below)
- ERC passed, DRC passed
⚒️ Hardware Architecture
230VAC Input
│
▼
Fuse Protection
│
▼
NTC Thermistor
│
▼
MOV + X2 Capacitor
│
▼
HLK-PM01
(Isolated AC-DC Module)
│
▼
Output Filter
(470µF + 100nF)
│
▼
TVS Protection
│
▼
LED Indicator📐 Schematic Highlights
Input protection
- 0.5A fuse
- 5D-9 NTC thermistor
- MOV (10D471K)
EMI suppression
- X2 safety capacitor
- Y2 safety capacitor
- 1MΩ bleeder resistor
Power conversion
- HLK-PM01 isolated AC-DC module (230VAC in, 5V DC out)
Output stage
- 470µF electrolytic capacitor
- 100nF ceramic capacitor
- SMBJ5.0A TVS diode (clamps ~9.2V — chosen for fast transient suppression while keeping standoff comfortably above the 5V rail)
- LED status indicator
🧩 PCB Design Insights
- Designed in KiCad 10
- Single-layer PCB
- Primary-secondary isolation maintained throughout layout
- 7.5 mm creepage/clearance barrier — sized for basic insulation at this voltage/pollution degree; reinforced insulation per IEC 62368-1 typically calls for wider spacing, so treat this as basic-isolation-only unless re-verified against the applicable standard
- Thick power traces for mains current
- Compact component placement
- ERC: 0 errors
- DRC: 0 errors
- Custom silkscreen labels
- Mounting holes included
🧪 Applications
- ESP32 / Arduino projects
- IoT devices
- Embedded systems
- Home automation
- Sensor nodes
- Industrial monitoring
- Educational / prototype development
⚠️ Limitations
- Fixed 5V output
- Output power limited by the HLK-PM01 module's rating
- No short-circuit indicator
- No reverse polarity protection on the output
- No output fuse — input fuse protects against mains-side faults only, not secondary-side shorts
- Indoor use only
- Requires a proper enclosure for mains safety
🚀 Future Improvements
- Add output fuse
- Add reverse polarity protection
- Add power ON switch
- Add AC power LED
- Improve thermal management
- Add test points
- Add mounting labels
- Design a double-layer version
- Add IEC input connector
- Improve EMI filtering
📚 Learning Outcomes
- PCB design using KiCad
- AC-DC power supply design
- Electrical isolation concepts (creepage & clearance)
- Component footprint selection
- PCB routing techniques
- EMI suppression methods
- Mains safety practices
- Design Rule Check (DRC) and Electrical Rule Check (ERC)
- PCB 3D visualization
📊 Specifications
| Parameter | Value |
|---|---|
| Project | Isolated 230VAC to 5VDC Power Supply using HLK-PM01 |
| Input Voltage | 230 VAC, 50 Hz |
| Output Voltage | 5 V DC |
| Output Power | 3 W |
| Output Current | Up to 600 mA |
| AC-DC Module | Hi-Link HLK-PM01 |
| Input Protection | 0.5 A Fuse, MOV (10D471K), 5D-9 NTC |
| EMI Filter | X2 Capacitor, Y2 Capacitor, 1 MΩ Bleeder |
| Output Protection | SMBJ5.0A TVS Diode |
| Output Filter | 470 µF + 100 nF Capacitors |
| Isolation | Galvanically Isolated (basic, 7.5 mm barrier) |
| PCB | Single-Layer FR-4 |
| Design Software | KiCad 10 |
| ERC Status | ✅ Passed (0 Errors) |
| DRC Status | ✅ Passed (0 Errors) |
| Applications | ESP32, Arduino, IoT, Embedded Systems |
👨💻 Author
Uttkarsh Chimane
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 0.1uF/275VAC | Capacitor_THT:C_Rect_L13.0mm_W5.0mm_P10.00mm_FKS3_FKP3_MKS4 | X2CAP1 |
| 1 | 0.5A/250V | Fuse:Fuseholder_Littelfuse_100_series_5x20mm | F1:Fuse1 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | 10D471K | Varistor:RV_Disc_D12mm_W4.5mm_P7.5mm | Varistor |
| 1 | 1MΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R_BLEED1 |
| 1 | 2.2nF Y2 250VAC | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | Y2_Safety_CAP1 |
| 1 | 470uF/10V | Capacitor_THT:CP_Radial_D8.0mm_P3.50mm | C2 |
| 1 | 470Ω | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | 5D-9,Inrush Limiter | Resistor_THT:R_Radial_Power_L12.0mm_W8.0mm_P5.00mm | NTC:Thermistor1 |
| 1 | AC INPUT | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J1 |
| 1 | HLK-PM01 | Converter_ACDC:Converter_ACDC_Hi-Link_HLK-PMxx | PS1 HLK-PM01 |
| 1 | LED | LED_THT:LED_D3.0mm | D1 |
| 1 | LOGO | LOGOs:UC 15x15mm | G*** |
| 1 | SMBJ5.0A | Diode_SMD:D_SMA | D_TVS1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J2 |
The 15 most common of 16 parts.
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Questions
How big is the Isolated SMPS Based Power Module PCB?
It measures 80 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Isolated SMPS Based Power Module use?
16 parts, built around the HLK-PM01, 10D471K, 470UF 10V 6.3*7 and SMBJ5.0A. 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 Isolated SMPS Based Power Module KiCad files?
From the uttkarsh-chimane/Isolated-AC-DC-SMPS-Based-Power-Module repository on GitHub, at the commit this page was made from: the board is hardware/Isolated SMPS Based Power Module.kicad_pcb and its schematic hardware/Isolated SMPS Based Power Module.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Isolated SMPS Based Power Module design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).