How to Use DC-DC Buck-Mode Power Module (8~28V to 5V 1.6A): Examples, Pinouts, and Specs

The DC-DC Buck-Mode Power Module (DFR0571), manufactured by DFRobot, is a compact and efficient step-down voltage regulator. It converts a higher input voltage (ranging from 8V to 28V) to a stable 5V output, capable of delivering up to 1.6A of current. This module is ideal for powering low-voltage devices such as microcontrollers, sensors, and other 5V-compatible electronics.

• Powering microcontrollers like Arduino, Raspberry Pi, or ESP32.
• Supplying stable 5V power to sensors, relays, and other peripherals.
• Battery-powered systems requiring efficient voltage regulation.
• Automotive electronics where 12V or 24V systems need to power 5V devices.

Below are the key technical details of the DFR0571 module:

The module has three main pins for input and output connections:

1. Connect Input Voltage:

   • Connect the positive terminal of your power source (8V to 28V) to the VIN pin.
   • Connect the negative terminal of your power source to the GND pin.

2. Connect Output Load:

   • Connect the VOUT pin to the positive terminal of your 5V device or load.
   • Connect the GND pin to the ground of your load.

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 to a stable 5V output.

• Input Voltage Range: Ensure the input voltage is within the specified range (8V to 28V). Exceeding this range may damage the module.
• Heat Dissipation: Although the module is highly efficient, prolonged operation at maximum current (1.6A) may generate heat. Ensure adequate ventilation or consider adding a heatsink if necessary.
• Polarity Protection: The module does not have built-in reverse polarity protection. Always connect the input voltage with the correct polarity.
• Load Requirements: Do not exceed the maximum output current of 1.6A to prevent damage to the module or connected devices.

The DFR0571 module can be used to power an Arduino UNO from a 12V power source. Below is an example circuit and Arduino code:

• Connect the 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 connected to pin 13 of Arduino UNO
// Ensure the Arduino is powered via the DFR0571 module

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. No Output Voltage:

   • Cause: Input voltage is below 8V or connections are incorrect.
   • Solution: Verify that the input voltage is within the 8V to 28V range and check all connections.

2. Overheating:

   • Cause: Module is operating at maximum current (1.6A) for extended periods or poor ventilation.
   • Solution: Improve ventilation or add a heatsink to the module.

3. Output Voltage Fluctuations:

   • Cause: Input voltage is unstable or load exceeds 1.6A.
   • Solution: Use a stable power source and ensure the load does not exceed the module's current rating.

4. Module Not Working After Connection:

   • Cause: Reverse polarity or input voltage exceeded 28V.
   • Solution: Check polarity before connecting and ensure the input voltage is within the specified range.

Q1: Can this module be used to power a Raspberry Pi?
A1: Yes, the module can power a Raspberry Pi, but ensure the total current draw (including peripherals) does not exceed 1.6A.

Q2: Does the module have short-circuit protection?
A2: No, the module does not have built-in short-circuit protection. Use external protection if needed.

Q3: Can I adjust the output voltage?
A3: No, the output voltage is fixed at 5V and cannot be adjusted.

Q4: Is the module suitable for automotive applications?
A4: Yes, the module can be used in automotive applications, as it supports input voltages up to 28V, commonly found in 12V and 24V systems.