How to Use WX-2412: Examples, Pinouts, and Specs

The WX-2412 is a compact, high-performance DC-DC converter designed for efficient voltage regulation in various electronic applications. It is ideal for scenarios requiring stable and adjustable output voltages, such as powering microcontrollers, sensors, and other low-power devices. The WX-2412 is equipped with a wide input voltage range, adjustable output voltage, and built-in protection mechanisms, including overcurrent and thermal shutdown, ensuring reliable operation in demanding environments.

• Powering microcontrollers (e.g., Arduino, Raspberry Pi)
• Voltage regulation for sensors and modules
• Battery-powered devices
• Industrial control systems
• Portable electronics

1. Power Input: Connect the input voltage (6V to 24V) to the VIN pin and ground to the GND pin.
2. Output Voltage Adjustment: Use a resistor divider or potentiometer connected to the ADJ pin to set the desired output voltage. Refer to the datasheet for the exact formula.
3. Enable Pin: To enable the converter, apply a logic high signal (e.g., 3.3V or 5V) to the EN pin. Leave it floating or pull it low to disable the converter.
4. Power Good Indicator: Use the PG pin to monitor the output voltage status. This pin is open-drain and requires a pull-up resistor.
5. Synchronization: If needed, connect an external clock signal to the SYNC pin to synchronize the switching frequency.

• Input Capacitor: Place a low-ESR capacitor (e.g., 10µF) close to the VIN pin to stabilize the input voltage.
• Output Capacitor: Use a low-ESR capacitor (e.g., 22µF) at the VOUT pin to ensure stable output voltage.
• Thermal Management: Ensure adequate ventilation or heat sinking if operating near the maximum current or in high-temperature environments.
• Voltage Adjustment: When adjusting the output voltage, ensure the resistor values are chosen to avoid exceeding the maximum output voltage rating.
• Enable Pin: If the EN pin is not used, connect it to VIN through a pull-up resistor to keep the converter enabled.

Below is an example of how to use the WX-2412 to power an Arduino UNO with a 5V output:

• Connect a 12V DC power supply to the VIN pin.
• Connect the GND pin to the ground of the power supply and Arduino.
• Adjust the ADJ pin to set the output voltage to 5V.
• Connect the VOUT pin to the Arduino's 5V input pin.

// Example code to monitor the Power Good (PG) pin of the WX-2412
// This code assumes the PG pin is connected to Arduino digital pin 2.

const int pgPin = 2; // Power Good pin connected to digital pin 2
const int ledPin = 13; // Onboard LED for status indication

void setup() {
  pinMode(pgPin, INPUT); // Set PG pin as input
  pinMode(ledPin, OUTPUT); // Set LED pin as output
  digitalWrite(ledPin, LOW); // Turn off LED initially
  Serial.begin(9600); // Initialize serial communication
}

void loop() {
  int pgStatus = digitalRead(pgPin); // Read the PG pin status

  if (pgStatus == HIGH) {
    // PG pin is HIGH, output voltage is stable
    digitalWrite(ledPin, HIGH); // Turn on LED
    Serial.println("Output voltage is stable.");
  } else {
    // PG pin is LOW, output voltage is not stable
    digitalWrite(ledPin, LOW); // Turn off LED
    Serial.println("Output voltage is not stable.");
  }

  delay(500); // Wait for 500ms before checking again
}

1. No Output Voltage

   • Cause: The EN pin is not connected or is pulled low.
   • Solution: Ensure the EN pin is connected to a logic high signal or VIN through a pull-up resistor.

2. Output Voltage is Unstable

   • Cause: Insufficient input or output capacitance.
   • Solution: Add low-ESR capacitors close to the VIN and VOUT pins.

3. Overheating

   • Cause: Operating near maximum current without proper cooling.
   • Solution: Improve ventilation or add a heat sink to the component.

4. PG Pin Always Low

   • Cause: Output voltage is not within the expected range.
   • Solution: Verify the resistor divider values and ensure the input voltage is sufficient.

Q: Can the WX-2412 be used with a 24V input to output 1.2V?
A: Yes, the WX-2412 supports a wide input voltage range (6V to 24V) and can regulate down to 1.2V, provided the output current does not exceed 2A.

Q: What happens if the input voltage exceeds 24V?
A: The WX-2412 is not designed to handle input voltages above 24V. Exceeding this limit may damage the component.

Q: Can I leave the SYNC pin unconnected?
A: Yes, the SYNC pin can be left unconnected if external synchronization is not required.