How to Use Matek 12S-PRO BEC: Examples, Pinouts, and Specs

The Matek 12S-PRO BEC is a high-performance battery eliminator circuit (BEC) designed to provide a stable and reliable output voltage for powering servos, flight controllers, and other onboard electronics. It is specifically engineered for use in multi-rotor drones and fixed-wing aircraft, where high-voltage battery packs (up to 12S LiPo) are commonly used. By stepping down the voltage from the battery pack, the Matek 12S-PRO BEC eliminates the need for separate power sources, reducing weight and complexity in your setup.

• Powering servos, flight controllers, and receivers in drones and RC aircraft.
• Providing a stable voltage supply for FPV (First-Person View) systems.
• Supporting high-voltage battery packs (up to 12S LiPo) in multi-rotor and fixed-wing platforms.
• Reducing the need for additional power supplies in compact or weight-sensitive designs.

• Input Voltage Range: 9V to 60V (3S to 12S LiPo)
• Output Voltage Options: Selectable 5V, 9V, 12V, or adjustable (via potentiometer)
• Maximum Output Current: 5A continuous, 6A peak
• Efficiency: Up to 95% (depending on input/output voltage)
• Dimensions: 21mm x 21mm x 6mm
• Weight: 4g
• Protection Features: Overcurrent, over-temperature, and short-circuit protection.

The Matek 12S-PRO BEC has a simple pin layout for easy integration into your circuit. Below is the pin configuration:

1. Connect the Input Voltage:

   • Connect the VIN+ and VIN- pins to the positive and negative terminals of your battery pack, respectively.
   • Ensure the input voltage is within the supported range (9V to 60V).

2. Set the Output Voltage:

   • If using a fixed output voltage (5V, 9V, or 12V), set the voltage selector switch or jumper to the desired setting.
   • For adjustable output, use the ADJ pin and a small screwdriver to turn the potentiometer until the desired voltage is achieved. Use a multimeter to verify the output voltage.

3. Connect the Load:

   • Connect the VOUT+ and VOUT- pins to the positive and negative terminals of the device(s) you want to power.

4. Verify Connections:

   • Double-check all connections to ensure proper polarity and secure wiring.

5. Power On:

   • Power on the system and monitor the output voltage to ensure it is stable and within the expected range.

• Heat Dissipation: The Matek 12S-PRO BEC is highly efficient, but it may still generate heat under high loads. Ensure adequate airflow or heat dissipation to prevent overheating.
• Current Limits: Do not exceed the maximum continuous current rating of 5A to avoid damaging the BEC.
• Voltage Adjustment: When using the adjustable mode, always verify the output voltage with a multimeter before connecting sensitive electronics.
• Polarity: Double-check the polarity of all connections to prevent damage to the BEC or connected devices.

The Matek 12S-PRO BEC can be used to power an Arduino UNO from a high-voltage battery pack. Below is an example setup:

1. Set the output voltage of the BEC to 5V.
2. Connect the VOUT+ pin of the BEC to the 5V pin on the Arduino UNO.
3. Connect the VOUT- pin of the BEC to the GND pin on the Arduino UNO.
4. Connect the VIN+ and VIN- pins of the BEC to the battery pack.

Here is a simple Arduino code example to blink an LED while powered by the Matek 12S-PRO BEC:

// Simple LED blink example for Arduino UNO
// Ensure the Matek 12S-PRO BEC is set to 5V output before connecting to the Arduino.

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 input connections or insufficient input voltage.
   • Solution: Verify that the VIN+ and VIN- pins are connected correctly and that the input voltage is within the supported range (9V to 60V).

2. Overheating:

   • Cause: High current draw or insufficient cooling.
   • Solution: Ensure the load does not exceed the maximum continuous current rating (5A). Improve airflow or add a heatsink if necessary.

3. Output Voltage Fluctuations:

   • Cause: Unstable input voltage or incorrect voltage adjustment.
   • Solution: Check the input voltage for stability. If using adjustable mode, recheck the output voltage with a multimeter and adjust as needed.

4. Short Circuit Protection Triggered:

   • Cause: A short circuit on the output side.
   • Solution: Disconnect the load and inspect for wiring issues or damaged components. Resolve the short circuit before reconnecting.

Q: Can the Matek 12S-PRO BEC power multiple devices simultaneously?
A: Yes, as long as the total current draw does not exceed the maximum continuous current rating of 5A.

Q: How do I know if the BEC is overheating?
A: The BEC includes over-temperature protection, which will shut it down if it overheats. If this occurs, reduce the load or improve cooling.

Q: Can I use the adjustable output mode for sensitive electronics?
A: Yes, but always verify the output voltage with a multimeter before connecting sensitive devices to avoid damage.

Q: Is the Matek 12S-PRO BEC compatible with 12S LiPo batteries?
A: Yes, it supports input voltages up to 60V, making it compatible with 12S LiPo battery packs.

This concludes the documentation for the Matek 12S-PRO BEC.