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

The 24/12V Buck Converter is a DC-DC step-down voltage regulator designed to efficiently convert a 24V input to a stable 12V output. This component is widely used in applications where a lower voltage is required to power devices from a higher voltage source. Its high efficiency ensures minimal power loss, making it ideal for battery-powered systems, automotive electronics, industrial equipment, and embedded systems.

• Powering 12V devices from a 24V battery or power supply
• Automotive systems (e.g., stepping down truck battery voltage)
• Industrial control systems
• Embedded systems and microcontroller projects
• LED lighting systems

The following table outlines the key technical details of the 24/12V Buck Converter:

The 24/12V Buck Converter typically has four pins or terminals. The table below describes each pin:

1. Connect the Input Voltage:
   • Connect the VIN pin to a 24V DC power source.
   • Ensure the input voltage is within the specified range (18V to 26V) to avoid damage.
2. Connect the Ground:
   • Connect the GND pin to the ground of your circuit.
3. Connect the Output Voltage:
   • Connect the VOUT pin to the load that requires 12V.
   • Ensure the load does not exceed the maximum output current of 5A.
4. Optional Enable Pin:
   • If the EN pin is available, connect it to a logic HIGH (e.g., 3.3V or 5V) to enable the converter. Leave it unconnected or pull it LOW to disable the converter.

• Heat Dissipation: The converter may generate heat during operation, especially at high currents. Use a heatsink or ensure proper ventilation to prevent overheating.
• Input Voltage Protection: Use a fuse or transient voltage suppressor (TVS) diode on the input to protect the converter from voltage spikes.
• Output Filtering: For sensitive applications, consider adding a capacitor (e.g., 100µF) across the output to reduce noise and ripple.
• Polarity: Double-check the polarity of the input and output connections to avoid damage to the converter or connected devices.

The 24/12V Buck Converter can be used to power an Arduino UNO from a 24V power source. Below is an example circuit and code:

• Connect the VIN pin of the buck converter to the 24V power source.
• Connect the GND pin of the buck converter to the ground of the power source and the Arduino.
• Connect the VOUT pin of the buck converter to the Arduino's VIN pin.

// Example code to blink an LED connected to pin 13 of the Arduino UNO
// Ensure the Arduino is powered via the 24/12V Buck Converter

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:

   • Check the input voltage to ensure it is within the specified range (18V to 26V).
   • Verify that the EN pin is connected to a logic HIGH (if applicable).
   • Inspect the connections for loose wires or incorrect polarity.

2. Overheating:

   • Ensure the load current does not exceed the maximum rating of 5A.
   • Improve ventilation or attach a heatsink to the converter.

3. Output Voltage Fluctuations:

   • Add a capacitor (e.g., 100µF) across the output to stabilize the voltage.
   • Check for noise or instability in the input power source.

4. Damaged Converter:

   • Verify that the input voltage polarity is correct.
   • Ensure the input voltage does not exceed 26V.

Q: Can I use the 24/12V Buck Converter to power multiple devices?
A: Yes, as long as the total current draw does not exceed the maximum output current of 5A.

Q: What happens if the input voltage drops below 18V?
A: The converter may fail to regulate the output voltage properly, leading to instability or a complete loss of output.

Q: Is the converter suitable for automotive applications?
A: Yes, the 24/12V Buck Converter is commonly used in automotive systems to step down truck or bus battery voltage to 12V.

Q: Can I adjust the output voltage?
A: Most 24/12V Buck Converters have a fixed output voltage. If adjustable output is required, look for a model with a potentiometer or adjustment feature.