![]() ![]() Drain: This current into the IRFZ44N through the drain terminal.Gate: This terminal/pin is used for controlling the biasing of the IRFZ44N power MOSFET.These power MOSFETs are available in a silicon-level design that adds a parasitic diode, which is a Zener diode (anti-parallel) across the source and drain terminals as shown in the figure, allowing the MOSFETs to operate in the reverse voltage. These power MOSFETs are highly efficient and reliable for various applications of switching, LED driver, and general and DC motor driver circuits. It is used to produce very low-resistance silicon regions with advanced processing techniques and high switching speed in robust device design. ![]() The IRFZ44N is a voltage-controlled variable N-channel Power MOSFET available in the TO-220 package in enhancement mode. This article gives a brief description of IRFZ44N N-channel power MOSFET, which is used in general motor driver applications and high-speed switching applications. IRF series N-channel Power MOSFETs are developed to control DC fans, the light intensity of LED strips, and DC motors without a relay. MOSFETs are preferred due to their low conduction and switching losses, and the DC gate current is zero because gate MOSFETs are made up of capacitors. Almost all modern switching power supplies use some form of power MOSFET as the switching element. I hope the above explanation has helped you understand how to achieve speed control of the Mac g5 fan.įor additional info regarding the MOSFET connection, please refer to this similar thread,In the 1980s, the advent of high-power MOSFETs made power switching more efficient and faster. Here we are not using the feedback /Sense pin which tells the computer how fast the fan motor is actually spinning. ![]() The relevant block diagram is as shown below, If you are using a logic level MOSFET, then gate driver is not required.Ģ) You can use a motor control chip off the shelf for carrying out this application. It is switched accordingly based on the code that is written in Arduino. The MOSFET is powered on from the same 12V supply. Speed controller can be achieved in 2 ways,ġ) One of the method to achieve the speed control here is to have a circuit similar to the one which you have explained.ī) PWM output from Arduino to the gate driver to the MOSFET which in-turn is given as the input to the PWM pin of the fan. Please refer to the following section for better understanding. But most of the fans doesnt work this way. This can be one of the ways of controlling the speed of the fan. When you vary the PWM output from 3V to 12V, by keeping the 12V supply constant, the speed of the fan can we varied. "I have tested this with 12, 5 and 3v to the PWM input and it works." I believe they have this separate 12V rail because at the minimum speed the Variable voltage rail dips to about 1.2v. It is a 50% duty cycle 4.0v square wave which varies from 28Hz at minimum speed to 111Hz at full speedĤ) PIN 4 - 12V (for fan logic) This appears to be a supply for the fan's speed feedback circuit and any other digital/control circuits on the fan. This is an output from the fan back to the controller to feedback the fan speed. This input varies from 3.9v RMS (5v Peak) at minimum speed to a smooth 12VDC at full speed.Ģ) PIN 2 - Speedo. I did some digging on the Mac g5 fan and found some info regarding the 4 pins,ġ) PIN 1 - Variable voltage power supply (speed control input). Thank you for posting on the Infineon Community. Infineon MATLAB/Simulink Users Community.AIROC™ Wi-Fi and Wi-Fi Bluetooth Combos. ![]()
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