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12 Volt Fan Speed Controller

Sunjumper

Sep 28, 2021
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Sep 28, 2021
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Hello Forum, Re my recent post asking guidance for controlling the speed of a 12 volt fan. I found a basic circuit which I made a diagram of. See my uploaded image. The circuit consists of a IRFZ44N MOSFET and a 10K potentiometer. Firstly, will this work and secondly is this circuit considered to be PWM? Regards, Sunjumper.Circuit 01.PNG
 

Harald Kapp

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Nov 17, 2011
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This type of power MOSFET is designed for switching operation. The circuit you show operates the MOSFET as a linear component. This can quickly destroy the MOSFET due to local overheating of the silicon structure.
 

Sunjumper

Sep 28, 2021
7
Joined
Sep 28, 2021
Messages
7
This type of power MOSFET is designed for switching operation. The circuit you show operates the MOSFET as a linear component. This can quickly destroy the MOSFET due to local overheating of the silicon structure.
Many thanks for your advice and guidance. It's very much appreciated. Sunjumper.
 
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