How to Use 24/12v Buck: Examples, Pinouts, and Specs

A 24/12V Buck Converter is a type of DC-DC converter that efficiently steps down an input voltage of 24 volts to a stable output voltage of 12 volts. This electronic component is widely used in automotive applications, solar power systems, and any electronic device that requires a regulated 12V DC supply from a 24V source.

• Powering 12V devices from a 24V battery
• Automotive electronics where the electrical system is 24V
• Solar power systems stepping down voltage for battery charging
• Robotics and hobbyist projects involving dual-voltage systems

• Input Voltage Range: 20V to 28V DC
• Output Voltage: 12V DC
• Maximum Output Current: 5A (Typical)
• Efficiency: Up to 95%
• Switching Frequency: 300kHz (Typical)
• Operating Temperature: -40°C to +85°C

1. Connect the positive terminal of the 24V source to the VIN pin of the Buck Converter.
2. Connect the ground terminal of the 24V source to the GND pin.
3. The VOUT pin will provide the regulated 12V output. Connect this to the device or circuit requiring 12V.
4. Optionally, connect the EN pin to a digital control signal to switch the converter on or off. A high signal (>2V) enables the converter, while a low signal (0V) disables it.

• Ensure that the input voltage does not exceed the maximum rating to prevent damage.
• Always use a fuse on the input side to protect against overcurrent conditions.
• Place a capacitor (typically 100µF to 1000µF) close to the input and output pins to minimize voltage spikes and improve stability.
• Avoid placing high-power devices close to the converter to prevent thermal interference.
• If the EN pin is not used, connect it to VIN through a pull-up resistor to ensure the converter remains enabled.

• Output voltage is lower than 12V: Check if the input voltage is within the specified range and that the load does not exceed the maximum output current.
• Converter is overheating: Ensure adequate ventilation and that the ambient temperature is within the operating range. Also, check for any short circuits or overloads.

• If the output voltage is unstable, add or increase the value of the output capacitor.
• If the converter does not power on, verify the EN pin is receiving a high signal or is properly connected to VIN if not used.
• Use a multimeter to check for continuity and proper voltage levels at the input and output.

• Q: Can I adjust the output voltage?

  • A: This Buck Converter is fixed at 12V output. For an adjustable output, look for a converter with an adjustable feedback (FB) pin.

• Q: What is the maximum power this converter can handle?

  • A: The maximum power is the product of the output voltage and maximum output current, which is 12V * 5A = 60W.

• Q: Is it necessary to use the EN pin?

  • A: No, the EN pin is optional for power-saving or controlled applications. If not used, ensure it is tied to VIN to keep the converter enabled.

// Define the enable pin for the Buck Converter
const int enablePin = 7;

void setup() {
  // Set the enable pin as an output
  pinMode(enablePin, OUTPUT);
  
  // Turn on the Buck Converter
  digitalWrite(enablePin, HIGH);
}

void loop() {
  // The Buck Converter is now providing a steady 12V output
  // Add your code here to interact with devices powered by the converter
}

Note: In this example, the Arduino UNO is used to control the EN pin of the Buck Converter. The converter itself does not interface directly with the Arduino for voltage conversion purposes. Ensure that the Arduino's digital pin connected to the EN pin can handle the required logic level voltage.