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12VDC Fan - 4 Pin

Discussion in 'General Electronics Discussion' started by Sadlercomfort, Dec 16, 2017.

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  1. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
  2. NMNeil

    NMNeil

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  3. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
    The 300mA current will come directly from the +12V and Gnd pin right. I thought there might be an internal Mosfet inside the fan, switching the ground based on the PWM signal at the gate, which would be rated for 300mA.
     
  4. NMNeil

    NMNeil

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    Oct 3, 2014
  5. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
    Last edited: Dec 17, 2017
  6. Sadlercomfort

    Sadlercomfort Ash

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    Feb 9, 2013
    Just to update incase anyone else plans on doing something similar:

    The 4-pin PWM 12VDC fan can be controlled using the PWM output of a microcontroller, which varies the PWM signal voltage from 0-5V by setting the duty cycle.

    Here's the circuit I used:

    [​IMG]

    However, the PWM frequency should be between 21-28kHz (Ideally 25kHz) and can be set in software using the uC registers.
     
    Arouse1973 likes this.
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