How to Use Mean Well LDH-45B-350 LED Driver: Examples, Pinouts, and Specs

The Mean Well LDH-45B-350 is a compact and efficient LED driver designed to deliver a constant current output of 350mA, making it ideal for powering LED lighting systems. With its wide input voltage range and high efficiency, this driver is suitable for a variety of applications, including indoor and outdoor LED lighting, signage, and architectural lighting. Its robust design ensures reliable performance in demanding environments.

• LED strip lighting
• Architectural and decorative lighting
• Signage and display systems
• General-purpose LED lighting solutions

The LDH-45B-350 LED driver has four primary connection points:

1. Power Supply Requirements:
   Ensure the input voltage to the driver is within the range of 9V to 56V DC. Use a regulated DC power supply for optimal performance.

2. Connecting the Input:

   • Connect the positive terminal of the DC power supply to the VIN+ pin.
   • Connect the negative terminal of the DC power supply to the VIN- pin.

3. Connecting the Output:

   • Connect the VOUT+ pin to the anode (positive terminal) of the LED.
   • Connect the VOUT- pin to the cathode (negative terminal) of the LED.

4. Load Considerations:

   • Ensure the total forward voltage of the connected LEDs falls within the driver's output voltage range (2V to 52V DC).
   • The driver provides a constant current of 350mA, so ensure the LEDs are rated for this current.

5. Mounting and Heat Dissipation:

   • Mount the driver in a location with adequate ventilation to prevent overheating.
   • If operating near the upper limit of the temperature range, consider additional cooling measures.

• Polarity: Always double-check the polarity of the connections to avoid damage to the driver or LEDs.
• Protection Features: The driver includes built-in protections for over-voltage, over-temperature, and short circuits. However, avoid prolonged exposure to these conditions.
• Dimming: The LDH-45B-350 does not include built-in dimming functionality. If dimming is required, consider using an external dimming circuit compatible with constant current drivers.

While the LDH-45B-350 is not directly controlled by an Arduino, you can use an Arduino to switch the driver on/off via a relay or MOSFET. Below is an example of how to control the driver using a relay module:

// Example: Controlling the LDH-45B-350 LED driver with an Arduino UNO
// This code toggles the LED driver on and off every 2 seconds.

const int relayPin = 7; // Pin connected to the relay module

void setup() {
  pinMode(relayPin, OUTPUT); // Set the relay pin as an output
  digitalWrite(relayPin, LOW); // Ensure the relay is off at startup
}

void loop() {
  digitalWrite(relayPin, HIGH); // Turn on the relay (and the LED driver)
  delay(2000); // Keep the LED driver on for 2 seconds
  digitalWrite(relayPin, LOW); // Turn off the relay (and the LED driver)
  delay(2000); // Keep the LED driver off for 2 seconds
}

Note: Ensure the relay module is rated for the input voltage of the LDH-45B-350.

1. Can I use this driver with dimmable LEDs?
   The LDH-45B-350 does not support dimming directly. Use an external dimming circuit if dimming is required.

2. What happens if I exceed the input voltage range?
   Exceeding the input voltage range may damage the driver. Always use a power supply within the specified range (9V to 56V DC).

3. Can I connect multiple LEDs to this driver?
   Yes, as long as the total forward voltage of the LEDs is within the output voltage range (2V to 52V DC) and they are connected in series.

4. Is the driver waterproof?
   No, the LDH-45B-350 is not waterproof. Use it in a dry environment or within a suitable enclosure for outdoor applications.

This concludes the documentation for the Mean Well LDH-45B-350 LED Driver. For further assistance, refer to the manufacturer's datasheet or contact Mean Well support.