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How to Use Power Mosfet IRF540

What is Power Mosfet IRF540

IRF540 is an N-channel MOSFET for very fast switching and amplification processes. It works in enhanced mode. Compared with ordinary transistors, their input impedance is very high, so they are very sensitive. It has many applications in daily life, such as switching regulator, relay driver, switching converter, motor driver, high-speed power switch driver, etc. You should also study other MOSFETs and compare their values with IRF540.

MOSFET is very sensitive to FET because of its very high input impedance. Compared with ordinary transistors, IRF540 has a very fast switching speed. It is based on HEXFET technology and operates at temperatures ranging from – 55 to 175 degrees Celsius. If we need to switch between different signals or perform the application of amplification process, then MOSFET IRF540 will be the best choice in this case, because it can switch very quickly compared with ordinary transistors of the same kind. It has a wide range of practical applications, such as high-speed high-power switch driver, switch regulator, relay driver, switch converter, motor driver and etc.

IRF540 datasheet

Power Mosfet IRF540 Pinouts

power mosfet irf540 pinout table
Pin NumberPin NameDescription
1SourceCurrent flows out through Source
2GateControls the biasing of the MOSFET
3DrainCurrent flows in through Drain
irf540 pinout description
irf540 pinout description

IRF540 Parameters and Application

  • Manufacturer: NXP Semiconductors
  • Product Category: MOSFET 
  • Technology: Si 
  • Mounting Style: Through Hole 
  • Package/Case: TO-220-3 
  • Number of Channels: 1 Channel 
  • Transistor Polarity: N-Channel 
  • Vds – Drain-Source Breakdown Voltage: 100 V 
  • Id – Continuous Drain Current: 23 A 
  • Rds On – Drain-Source Resistance: 77 mOhms 
  • Vgs – Gate-Source Voltage: 20 V 
  • Minimum Operating Temperature: – 55 C 
  • Maximum Operating Temperature: + 175 C 
  • Configuration: Single 
  • Pd – Power Dissipation: 100 W 
  • Channel Mode: Enhancement 
  • Fall Time: 24 ns  
  • Rise Time: 39 ns  
  • Typical Turn-Off Delay Time: 26 ns  
  • Typical Turn-On Delay Time: 8 ns  

IRF540 usually uses in the following situations:

  • Switching high power devices
  • Control speed of motors
  • LED dimmers or flashers
  • High Speed switching applications
  • Converters or Inverter circuits

How to Use Power Mosfet IRF540

This part of this tutorial will develop the basic operating principles on which IRF540 is based. The operation principle of IRF540 is very simple. It has three types of terminals: drain, gate and source. When we apply a pulse to the gate terminal, the gate and drain become shorter, that is to say, a common connection is established between them. When the gate and drain are short-circuited, only in this way can we obtain the desired results, otherwise, it will produce unnecessary or unwanted results.

Unlike transistors, MOSFETs are voltage-controlled devices. This means that they can be enabled or disabled by providing the required threshold voltage (VGS). IRF540 is an N-channel MOSFET, so the drain and source pins remain disconnected when no voltage is applied to the gate. These pins are closed when the grid voltage is applied. The following circuit shows the behavior of the Mosfet when the gate voltage (5V) is applied and the gate voltage (0V) is not applied. Since this is an N-channel Mosfet, the load to be switched (in this case, the motor) must always be connected above the discharge needle.

When Mosfet is turned on by supplying the necessary voltage to the gate pin, it will remain on unless 0V is supplied to the gate. To avoid this problem, a pull-down resistor (R1) must always be used, where I use a value of 10K. In applications such as motor speed control or dimming, we will use PWM signals for fast switching. In this case, the gate capacitance of MOSFET will generate reverse current due to parasitic effect. To solve this problem, we should use a current limiting capacitor, where I use a value of 470.

irf540 circuit
irf540 circuit

The device is most suitable for high power DC switching applications, such as high current SMPS power supply, compact ferrite inverters, iron core inverters, step-down and step-up converters, power amplifiers, motor speed controllers, robots, etc.

IRF540 is N-channel Mosfet. The MOSFET can support loads up to 23a and peak currents up to 110A. It also has a threshold voltage of 4V, which means it can be easily controlled by low voltage such as 5V. This is why it is mainly used with Arduino and other microcontrollers for logical switching. Because Mosfet has good switching characteristics, it can also control the speed of motor and dimmer. Therefore, if you’re looking for Mosfet to switch applications that consume a lot of power on some logic-level devices, that Mosfet will be your ideal choice.


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