How to Use HLK-5M05 AC-DC Power Module: Examples, Pinouts, and Specs

The HLK-5M05 is a compact and efficient AC-DC power supply module designed to convert a wide range of AC input voltages (85-265V AC) into a stable 5V DC output. This module is widely used in applications requiring a reliable and space-saving power solution for low-voltage electronic devices. Its small size and high efficiency make it ideal for use in IoT devices, home automation systems, embedded systems, and other low-power electronic projects.

• Powering microcontrollers (e.g., Arduino, ESP8266, ESP32)
• IoT devices and smart home systems
• Industrial control systems
• Low-power LED lighting
• Battery charging circuits

The HLK-5M05 module is designed to meet the needs of a variety of low-power applications. Below are its key technical specifications:

The HLK-5M05 module has six pins for input and output connections. The table below describes each pin:

1. Connect the AC Input:

   • Connect the AC-L pin to the live wire of the AC power source.
   • Connect the AC-N pin to the neutral wire of the AC power source.
   • Ensure proper insulation and safety precautions when working with high-voltage AC.

2. Connect the DC Output:

   • Use the +5V pin to supply power to your circuit's positive rail.
   • Connect the GND pin to the ground rail of your circuit.

3. Mounting the Module:

   • Secure the module on a PCB or enclosure using appropriate mounting hardware.
   • Ensure adequate spacing and insulation to prevent accidental contact with high-voltage pins.

4. Filtering and Decoupling:

   • Add a 0.1µF ceramic capacitor and a 10µF electrolytic capacitor across the +5V and GND pins to reduce noise and stabilize the output voltage.

• Safety First: Always handle the module with care when working with AC voltage. Ensure proper insulation and avoid touching the module while it is powered.
• Heat Dissipation: Although the module is efficient, it may generate heat during operation. Ensure proper ventilation or heat sinking if used in high-temperature environments.
• Load Requirements: Do not exceed the maximum output current of 1A to avoid damaging the module.
• Isolation: The module provides 3000V AC isolation, making it safe for use in applications requiring electrical isolation between the input and output.

The HLK-5M05 can be used to power an Arduino UNO directly. Below is an example circuit and Arduino code:

• Connect the AC-L and AC-N pins to the AC power source.
• Connect the +5V pin to the Arduino UNO's 5V pin.
• Connect the GND pin to the Arduino UNO's GND pin.

// Example code to blink an LED using Arduino UNO powered by HLK-5M05

const int ledPin = 13; // Pin connected to the onboard LED

void setup() {
  pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}

void loop() {
  digitalWrite(ledPin, HIGH); // Turn the LED on
  delay(1000);                // Wait for 1 second
  digitalWrite(ledPin, LOW);  // Turn the LED off
  delay(1000);                // Wait for 1 second
}

1. No Output Voltage:

   • Cause: Incorrect AC input connections or insufficient input voltage.
   • Solution: Verify that the AC-L and AC-N pins are connected correctly and that the input voltage is within the specified range (85-265V AC).

2. Output Voltage Fluctuations:

   • Cause: Insufficient filtering or unstable input voltage.
   • Solution: Add decoupling capacitors (e.g., 0.1µF and 10µF) across the output pins to stabilize the voltage.

3. Module Overheating:

   • Cause: Excessive load or poor ventilation.
   • Solution: Ensure the load does not exceed 1A and provide adequate ventilation or heat sinking.

4. Short Circuit Protection Triggered:

   • Cause: Output pins are shorted.
   • Solution: Disconnect the module, check for shorts in the circuit, and reconnect after resolving the issue.

Q1: Can the HLK-5M05 power a Raspberry Pi?
A1: No, the HLK-5M05 provides a maximum current of 1A, which is insufficient for most Raspberry Pi models. Use a power supply with higher current capacity.

Q2: Is the module safe for long-term use?
A2: Yes, the HLK-5M05 is designed for long-term use, provided it is operated within its specified limits and proper safety precautions are followed.

Q3: Can I use the module outdoors?
A3: The HLK-5M05 is not weatherproof. If outdoor use is required, ensure it is enclosed in a weatherproof housing.

Q4: What happens if the input voltage exceeds 265V AC?
A4: Exceeding the input voltage range may damage the module. Use a voltage regulator or surge protector to prevent overvoltage.