How to Use hlk-ld2450: Examples, Pinouts, and Specs

The HLK-LD2450 is a compact and efficient AC-DC power module designed to convert a wide range of AC input voltages (85-265V AC) into a stable 5V DC output. This module is ideal for powering low-power electronic devices and is widely used in IoT applications, home automation, and embedded systems. Its small size and high efficiency make it a popular choice for projects requiring reliable DC power from an AC source.

• Powering microcontrollers (e.g., Arduino, ESP8266, ESP32)
• IoT devices and smart home systems
• Low-power sensors and modules
• Embedded systems and prototyping
• Replacing bulky linear power supplies in compact designs

The HLK-LD2450 offers robust performance and safety features. Below are its key technical specifications:

The HLK-LD2450 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 handling AC connections.

2. Connect the DC Output:

   • Use the +5V pin to power your device or circuit.
   • Connect the GND pin to the ground of your circuit.

3. Mounting the Module:

   • Secure the module on a PCB or enclosure using appropriate mounting techniques.
   • Ensure adequate spacing and insulation to prevent short circuits.

4. Power On:

   • After verifying all connections, power on the AC source.
   • Measure the output voltage to confirm a stable 5V DC before connecting sensitive devices.

• Safety First: Always handle the module with care when working with high-voltage AC inputs. Use proper insulation and avoid touching live wires.
• Load Requirements: Ensure the connected load does not exceed the maximum output current of 450mA.
• Heat Dissipation: Although the module is efficient, ensure proper ventilation to avoid overheating, especially in enclosed spaces.
• Testing: Before integrating the module into your final design, test it with a multimeter to verify the output voltage and current.

The HLK-LD2450 can be used to power an Arduino UNO directly. Below is an example circuit and code to blink an LED using the module:

1. Connect the AC-L and AC-N pins to the AC power source.
2. Connect the +5V pin to the Arduino UNO's 5V pin.
3. Connect the GND pin to the Arduino UNO's GND pin.
4. Connect an LED to pin 13 of the Arduino UNO with a 220-ohm resistor in series.

// Simple LED Blink Example
// This code blinks an LED connected to pin 13 of the Arduino UNO.
// Ensure the HLK-LD2450 is providing a stable 5V DC to the Arduino.

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. No Output Voltage:

   • Verify that the AC input connections (AC-L and AC-N) are correct.
   • Check for loose or broken wires.
   • Ensure the AC input voltage is within the specified range (85-265V AC).

2. Output Voltage is Unstable:

   • Ensure the connected load does not exceed 450mA.
   • Check for proper grounding of the module and the circuit.
   • Verify that the AC input voltage is stable.

3. Module Overheating:

   • Ensure adequate ventilation around the module.
   • Reduce the load if it is near the maximum output current.

4. Arduino Not Powering On:

   • Confirm that the +5V and GND pins are correctly connected to the Arduino.
   • Measure the output voltage of the module to ensure it is providing 5V DC.

Q: Can the HLK-LD2450 power devices other than Arduino?
A: Yes, the module can power any device that requires a stable 5V DC supply and consumes less than 450mA.

Q: Is the module safe to use with high-voltage AC?
A: Yes, the HLK-LD2450 is designed for high-voltage AC input and includes isolation and safety features. However, always follow proper safety precautions when working with AC power.

Q: Can I use this module outdoors?
A: The HLK-LD2450 is not waterproof or weatherproof. If used outdoors, it must be enclosed in a weatherproof housing.

Q: What happens if I exceed the maximum output current?
A: Exceeding the maximum output current may cause the module to overheat, shut down, or fail. Always ensure the load is within the specified limits.