How to Use Ultra-Small Size DC-DC 5V 3A BEC Power Supply Buck Step Down Module: Examples, Pinouts, and Specs

The Ultra-Small Size DC-DC 5V 3A BEC Power Supply Buck Step Down Module by Robu is a compact and efficient DC-DC converter designed to step down a higher input voltage to a stable 5V output. With a maximum current output of 3A, this module is ideal for powering low-voltage devices such as microcontrollers, sensors, and other electronic components. Its small size and high efficiency make it suitable for space-constrained applications.

• Powering microcontrollers (e.g., Arduino, Raspberry Pi, ESP32)
• Supplying power to sensors, servos, and small motors
• Battery-powered projects requiring a regulated 5V output
• Robotics and drones for powering onboard electronics
• DIY electronics and prototyping

The following table outlines the key technical details of the module:

The module has three pins for input and output connections:

1. Connect the Input Voltage:

   • Connect the positive terminal of your power source (6V to 26V) to the VIN pin.
   • Connect the negative terminal of your power source to the GND pin.

2. Connect the Output Load:

   • Connect the positive terminal of your load (e.g., microcontroller, sensor) to the VOUT pin.
   • Connect the negative terminal of your load to the GND pin.

3. Verify Connections:

   • Double-check all connections to ensure proper polarity and avoid short circuits.

4. Power On:

   • Turn on the power source. The module will regulate the input voltage and provide a stable 5V output.

• Input Voltage Range: Ensure the input voltage is within the specified range (6V to 26V). Exceeding this range may damage the module.
• Heat Dissipation: At higher currents (close to 3A), the module may generate heat. Ensure proper ventilation or use a heatsink if necessary.
• Load Requirements: Do not exceed the maximum output current of 3A to avoid overloading the module.
• Polarity Protection: The module does not have reverse polarity protection. Double-check the polarity of your connections before powering on.

The module can be used to power an Arduino UNO by stepping down a higher voltage (e.g., 12V) to 5V. Below is an example circuit and code:

• Connect a 12V power source to the VIN and GND pins of the module.
• Connect the VOUT pin of the module to the 5V pin of the Arduino UNO.
• Connect the GND pin of the module to the GND pin of the Arduino UNO.

// Example code to blink an LED using Arduino UNO powered by the DC-DC module

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 voltage or loose connections.
   • Solution: Verify that the input voltage is within the 6V to 26V range and check all connections.

2. Overheating:

   • Cause: High current draw or insufficient ventilation.
   • Solution: Reduce the load current or improve heat dissipation by adding a heatsink or ensuring proper airflow.

3. Output Voltage Fluctuations:

   • Cause: Unstable input voltage or excessive load.
   • Solution: Use a stable power source and ensure the load does not exceed 3A.

4. Module Not Working After Connection:

   • Cause: Reverse polarity or input voltage exceeding the maximum limit.
   • Solution: Check the polarity of the connections and ensure the input voltage is within the specified range.

Q: Can this module be used with a LiPo battery?
A: Yes, as long as the battery voltage is within the 6V to 26V range.

Q: Does the module have short-circuit protection?
A: No, the module does not have built-in short-circuit protection. Use it with care to avoid damage.

Q: Can I adjust the output voltage?
A: No, the output voltage is fixed at 5V and cannot be adjusted.

Q: Is it safe to use this module for powering sensitive electronics?
A: Yes, the module provides a stable 5V output, making it suitable for sensitive electronics. However, ensure proper connections and avoid overloading.

This concludes the documentation for the Ultra-Small Size DC-DC 5V 3A BEC Power Supply Buck Step Down Module by Robu. For further assistance, refer to the manufacturer's datasheet or contact technical support.