How to Use BEC: Examples, Pinouts, and Specs

A Buck-Boost Converter (BEC) is a type of DC-DC converter designed to efficiently step down (buck) or step up (boost) voltage levels. Manufactured by APEX RC, the 3AMP 6-25.2V 5V/6V BEC is a versatile power management component that ensures stable voltage output for sensitive electronic devices. It is commonly used in remote-controlled vehicles, drones, robotics, and other applications requiring reliable voltage regulation.

• Powering RC receivers, servos, and flight controllers in drones and RC vehicles.
• Voltage regulation for microcontrollers and sensors in robotics.
• Providing stable power to LED lighting systems.
• General-purpose DC-DC voltage conversion in portable electronics.

1. Connect the Input Terminals:

   • Attach the positive terminal of your DC power source (6V to 25.2V) to the Input (+) pin.
   • Connect the ground of your power source to the Input (-) pin.

2. Set the Output Voltage:

   • Use the jumper or switch on the BEC to select the desired output voltage (5V or 6V).

3. Connect the Output Terminals:

   • Attach the Output (+) pin to the positive terminal of your load (e.g., RC receiver, microcontroller).
   • Connect the Output (-) pin to the ground of your load.

4. Verify Connections:

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

5. Power On:

   • Turn on the DC power source. The BEC will regulate the input voltage to the selected output voltage.

• Input Voltage Range: Ensure the input voltage is within the specified range (6V to 25.2V) to avoid damage.
• Current Limit: Do not exceed the maximum output current of 3A to prevent overheating or failure.
• Heat Dissipation: If operating near the maximum current, ensure adequate ventilation or cooling to maintain efficiency.
• Polarity: Always observe correct polarity when connecting the input and output terminals.
• Voltage Selection: Confirm the output voltage setting (5V or 6V) before connecting sensitive devices.

The BEC can be used to power an Arduino UNO by providing a stable 5V output. Below is an example circuit and code:

1. Connect the BEC's Output (+) to the Arduino's 5V pin.
2. Connect the BEC's Output (-) to the Arduino's GND pin.
3. Power the BEC with a DC source (e.g., a 2S or 3S LiPo battery).

// Example code to blink an LED using an Arduino UNO powered by the BEC
// Ensure the BEC is set to 5V output before connecting to the Arduino

const int ledPin = 13; // Built-in LED pin on Arduino UNO

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. Can I use the BEC with a 4S LiPo battery?

   • Yes, as long as the battery voltage is within the 6V to 25.2V range.

2. How do I select between 5V and 6V output?

   • Use the onboard jumper or switch to toggle between the two voltage options.

3. What happens if I exceed the 3A current limit?

   • The BEC may overheat or shut down to protect itself. Always ensure the load does not exceed 3A.

4. Can I use the BEC to power multiple devices?

   • Yes, as long as the total current draw does not exceed 3A.

5. Is the BEC waterproof?

   • No, the BEC is not waterproof. Protect it from moisture and water exposure.

This documentation provides a comprehensive guide to using the APEX RC 3AMP 6-25.2V 5V/6V BEC. Follow the instructions and best practices to ensure optimal performance and longevity of the component.