How to Use IRF520 PWM: Examples, Pinouts, and Specs

The IRF520 PWM module is a versatile and powerful electronic component designed for controlling high-power loads with digital signals. It is based on the IRF520 power MOSFET and is capable of handling high currents and voltages. This module is commonly used in applications involving Pulse Width Modulation (PWM) to control the power delivered to devices such as motors, LEDs, and heating elements. Its ease of use and robustness make it a popular choice for hobbyists and professionals alike.

• Motor speed control
• LED dimming and RGB lighting
• Heating elements control
• Switching high-power loads with microcontrollers

• Voltage Rating (VDS): 100V
• Drain Current (ID): 9.7A
• Power Dissipation (PD): 60W
• RDS(on): 0.27Ω at VGS = 10V
• Gate Threshold Voltage (VGS(th)): 2.0V to 4.0V

1. Connect the V+ pin to a positive voltage source suitable for your load.
2. Connect the GND pin to the common ground of your power supply and microcontroller.
3. Connect the SIG pin to a PWM-capable digital output on your microcontroller.
4. Connect the load between the V- pin and the positive terminal of your power supply.

• Ensure the power supply voltage does not exceed the maximum VDS rating of the module.
• The total current through the load should not exceed the maximum ID rating.
• Use a heatsink if the power dissipation is expected to be high during operation.
• Always provide a proper gate signal; floating gate can lead to unpredictable behavior.
• Use a flyback diode when controlling inductive loads to prevent voltage spikes.

// Define the PWM signal pin connected to the IRF520 module
const int pwmPin = 3;

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

void loop() {
  // Increase the brightness gradually
  for (int dutyCycle = 0; dutyCycle <= 255; dutyCycle++) {
    // Write the PWM signal to the IRF520 module
    analogWrite(pwmPin, dutyCycle);
    delay(10);
  }

  // Decrease the brightness gradually
  for (int dutyCycle = 255; dutyCycle >= 0; dutyCycle--) {
    analogWrite(pwmPin, dutyCycle);
    delay(10);
  }
}

• LEDs or motor not responding to PWM signal: Check the connections and ensure the signal pin is configured correctly in the code.
• Module overheating: Ensure the current through the MOSFET does not exceed the rated ID and that a heatsink is used if necessary.
• Unexpected behavior when switching inductive loads: Make sure a flyback diode is installed across the load.

• Double-check wiring against the pin configuration table.
• Use a multimeter to verify the presence of the PWM signal at the SIG pin.
• If using a microcontroller, ensure the code is uploaded correctly and the correct pin is defined for PWM output.

Q: Can I control the IRF520 PWM module with a 3.3V logic level? A: Yes, but the performance may be reduced as the gate threshold voltage is between 2.0V and 4.0V.

Q: What is the maximum frequency for the PWM signal? A: The IRF520 can typically handle PWM frequencies up to several kHz. Check the datasheet for exact figures.

Q: Is it necessary to use a heatsink? A: It depends on the current through the MOSFET and the ambient temperature. If the MOSFET is getting hot to the touch, a heatsink is recommended.

Q: Can I use this module to switch AC loads? A: No, the IRF520 is designed for DC loads only. Switching AC loads requires different types of components such as TRIACs or relays designed for AC operation.