How to Use 12v COB LED Strip: Examples, Pinouts, and Specs

The 12V COB LED Strip by Xunata (Manufacturer Part ID: 12V COB LED Light) is a flexible lighting solution that utilizes Chip-on-Board (COB) technology. This advanced design ensures a seamless, uniform light output without visible LED dots, making it ideal for applications requiring smooth and consistent illumination. Operating at 12 volts, this LED strip is energy-efficient and versatile, suitable for a wide range of lighting projects.

• Accent Lighting: Highlight architectural features, furniture, or artwork.
• Ambient Lighting: Create a warm and inviting atmosphere in living spaces.
• Task Lighting: Illuminate workspaces, such as desks or kitchen counters.
• Automotive Lighting: Enhance vehicle interiors or exteriors.
• DIY Projects: Perfect for custom lighting designs in hobbyist projects.

The 12V COB LED Strip typically has two connection points: Positive (+) and Negative (-). These are located at both ends of the strip for easy wiring.

1. Power Supply: Use a regulated 12V DC power supply with sufficient current capacity. For example, if using 5 meters of the strip (10W/m), ensure the power supply can provide at least 50W (4.2A at 12V).
2. Connecting the Strip:
   • Identify the + (VCC) and - (GND) terminals on the strip.
   • Connect the + (VCC) terminal to the positive output of the power supply.
   • Connect the - (GND) terminal to the negative output of the power supply.
3. Cutting the Strip: The strip can be cut at marked intervals (usually every 50mm). Ensure cuts are made cleanly at the designated points to avoid damaging the circuit.
4. Mounting: Use the adhesive backing (if available) to attach the strip to a clean, dry surface. For waterproof models, additional mounting clips may be required.

• Voltage Matching: Ensure the power supply voltage matches the strip's 12V requirement. Overvoltage can damage the LEDs.
• Heat Management: For long strips or high-power applications, consider using an aluminum channel or heatsink to dissipate heat.
• Polarity: Double-check the polarity of connections. Reversing the polarity may damage the strip.
• Dimming: Use a compatible PWM dimmer for brightness control. Avoid using resistive dimmers, as they may not work correctly with LED strips.
• Waterproofing: For outdoor or wet environments, use the IP65-rated version and seal all connections with waterproof connectors or silicone.

The 12V COB LED Strip can be controlled using an Arduino UNO and a MOSFET for PWM dimming. Below is an example circuit and code:

• Connect the + (VCC) terminal of the LED strip to the 12V power supply.
• Connect the - (GND) terminal of the LED strip to the Drain pin of an N-channel MOSFET (e.g., IRF540N).
• Connect the Source pin of the MOSFET to the GND of the power supply.
• Connect the Gate pin of the MOSFET to a PWM-capable pin on the Arduino (e.g., Pin 9).
• Connect the Arduino's GND to the power supply's GND.

// Example code to control the brightness of a 12V COB LED Strip
// using PWM on an Arduino UNO.

const int ledPin = 9; // PWM pin connected to the MOSFET Gate
int brightness = 0;   // Initial brightness level (0-255)
int fadeAmount = 5;   // Amount to change brightness by

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

void loop() {
  analogWrite(ledPin, brightness); // Set the brightness using PWM

  // Change the brightness for the next loop iteration
  brightness += fadeAmount;

  // Reverse the direction of fading at the ends of the range
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }

  delay(30); // Wait for 30ms to create a smooth fade effect
}

1. LED Strip Does Not Light Up:

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Verify the polarity of connections and ensure the power supply provides adequate voltage and current.

2. Uneven Brightness Along the Strip:

   • Cause: Voltage drop over long strips.
   • Solution: Use power injection at multiple points along the strip to maintain consistent voltage.

3. Overheating:

   • Cause: Insufficient heat dissipation.
   • Solution: Mount the strip on an aluminum channel or heatsink to improve heat dissipation.

4. Flickering:

   • Cause: Incompatible dimmer or unstable power supply.
   • Solution: Use a compatible PWM dimmer and a regulated power supply.

5. Adhesive Backing Fails:

   • Cause: Dusty or uneven mounting surface.
   • Solution: Clean the surface thoroughly before mounting or use additional mounting clips.

• Can I cut the strip to a custom length? Yes, the strip can be cut at marked intervals (usually every 50mm). Ensure cuts are made at the designated points.

• Is the strip waterproof? The strip is available in both IP20 (non-waterproof) and IP65 (waterproof) versions. Choose the appropriate version for your application.

• Can I connect multiple strips together? Yes, but ensure the power supply can handle the total current draw. For long runs, use power injection to prevent voltage drop.

• What is the lifespan of the strip? The strip has an estimated lifespan of ~50,000 hours under normal operating conditions.

• Can I dim the strip? Yes, the strip can be dimmed using a compatible PWM dimmer or an Arduino with a MOSFET.

This documentation provides a comprehensive guide to using the 12V COB LED Strip by Xunata. Follow the instructions and best practices to ensure optimal performance and longevity of your lighting project.