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The HLK-PM01 power module offers a compact and cost-effective solution by integrating AC-DC conversion, isolation, and protection features into a small PCB-mount package. This article will discuss the HLK-PM01 datasheet details, pin configuration, specifications, working principles, applications, advantages, and design considerations.
The HLK-PM01 is a compact AC-DC power supply module designed to convert 100–240V AC (including 230V mains) into a stable 5V DC output. It delivers up to 3W of power (600mA), making it ideal for small electronic circuits and embedded systems. This module uses switch-mode technology, allowing high efficiency and low heat generation in a small, PCB-mountable package.
The HLK-PM01 features isolated output, overload protection, short-circuit protection, and low ripple noise for stable performance. Because it connects directly to mains voltage, proper insulation and safe PCB layout are important during design.
If you are interested in purchasing the HLK-PM01, feel free to contact us for pricing and availability.
| Pin Name | Type | Description |
| AC-L (Phase) | Input (AC) | Connects to the live/phase wire of the 100–240V AC mains supply. |
| AC-N (Neutral) | Input (AC) | Connects to the neutral wire of the AC mains supply. |
| +5V | Output (DC) | Provides regulated +5V DC output (up to 600mA / 3W). |
| GND | Output (DC) | Ground reference for the 5V DC output. |
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| Category | Parameter | Specification |
| Features | Input Voltage | 100–240V AC |
| Input Frequency | 50–60Hz | |
| Output Voltage | 5V DC | |
| Rated Output Current | 600mA | |
| Power | 3W | |
| Peak Output Current | 1000mA | |
| Maximum Input Current | 0.2A | |
| Efficiency | 70% | |
| Protection | Built-in short circuit & over-current protection | |
| Safety Characteristics | UL Fuse | 0.5A UL certified |
| PCB Material | Double-sided copper clad, 94-V0 fire rating | |
| Safety Standards | UL1012, EN60950, UL60950 | |
| Insulation Voltage | I/P–O/P: 2500VAC | |
| Insulation Resistance | ≥100MΩ (500VDC, 25°C, 70% RH) | |
| EMI Compliance | EN55011, EN55022 (CISPR22) | |
| ESD Protection | IEC/EN 61000-4-2 Level 4 (8kV / 15kV) | |
| RF Immunity | IEC/EN 61000-4-3 | |
| Electrical Characteristics | Input Voltage Range | 90–264VAC |
| Maximum Input Voltage | ≤270VAC | |
| Inrush Current | ≤10A | |
| Start-up Time | ≤50ms | |
| Efficiency @110VAC | ≥69% (Full Load) | |
| Efficiency @220VAC | ≥70% (Full Load) | |
| MTBF | ≥100,000 hours | |
| Rated Output Voltage | +5VDC ±0.1V | |
| Full Load Output Voltage | +5VDC ±0.2V | |
| Voltage Regulation | ±0.2% | |
| Load Regulation | ±0.5% | |
| Ripple & Noise | ≤50mVp-p (20MHz BW) | |
| Over-current Protection | 150–200% of rated load | |
| Short Circuit Protection | Auto recovery after fault removal |
How the HLK-PM01 AC-DC power module converts high-voltage AC input into a stable 5V DC output for low-voltage electronics? On the left side of the circuit, the AC mains enters through connector P1. The fuse (F_curr) protects the circuit from overcurrent, while the thermal fuse (F_therm) provides protection against overheating. The MOV (metal oxide varistor) connected across the AC lines absorbs voltage spikes and surge transients, helping protect the HLK-PM01 from damage caused by lightning or switching surges.
The AC input is then applied to pins 1 and 2 of the HLK-PM01 module. Inside the module, the AC voltage is rectified, filtered, and regulated through an internal switching power supply circuit. It converts 220–230V AC into a regulated 5V DC output with up to 3W power capability.
On the output side, capacitors C1 (10µF) and C2 (100nF) are placed across +Vo and -Vo to reduce ripple and high-frequency noise. The larger capacitor smooths low-frequency ripple, while the smaller capacitor filters high-frequency switching noise. The regulated 5V output is then delivered to connector P2, providing stable DC power for microcontrollers or other low-voltage devices.
• Smart home devices
• IoT modules
• WiFi & Bluetooth modules
• Microcontroller boards (Arduino, ESP8266, ESP32)
• Industrial control systems
• Relay control circuits
• LED control systems
• Power supply for sensors
• Home automation switches
• Security and alarm systems
• Smart meters
• Embedded systems
• DIY electronics projects
• Low-power communication devices
• Access control systems
• Wide input voltage range (90–264VAC)
• Direct AC to 5V DC conversion
• Compact PCB-mount design
• Fully isolated output (2500VAC isolation)
• Built-in short circuit protection
• Built-in over-current protection
• Low output ripple (≤50mVp-p)
• Good voltage regulation (±0.2%
• No external transformer required
• Low cost solution for embedded systems
• Easy integration into small projects
• Limited output power (3W max)
• Maximum continuous current only 600mA
• Moderate efficiency (~70%)
• Generates heat under full load
• Requires external fuse and MOV for proper protection
• Not ideal for high-current devices
• Limited output voltage option (fixed 5V version)
• EMI filtering may require additional components
• Not suitable for battery charging applications
• No adjustable output voltage option
The HLK-PM01’s integrated switch-mode design, isolation protection, low ripple output, and compliance with major safety standards make it suitable for embedded systems, IoT devices, and small industrial applications. By understanding its specifications, circuit implementation, safety requirements, and limitations, you can integrate the module more effectively and safely into your projects. While it is not intended for high-power or adjustable voltage applications, it remains a reliable and economical solution for low-power 5V systems requiring direct mains input conversion.
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