HEXFET Drive

Discussion in 'General Electronics Chat' started by ectmlk, Feb 13, 2008.

  1. ectmlk

    Thread Starter Member

    Feb 11, 2008
    21
    0
    Hey
    Driving a DC Brushed motor via PWM, basically i am using a IRF520 HEXFET however it the max Ids is 9A, the motor Iam using is less then 1Amp, could i possibly move to the IRFL014N it is a 2Amp Hexfet, is it possible that the 520 is more robust against voltage spikes transients caused by the motor switching?

    Thanks
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    Are you sure your motor doesn't require a bit of extra starting current? Running and current required to overcome inertia are two different ratings that can differ significantly. If it isn't for a high volume application, then just go a bit overkill just in case.

    Also, just because a device is rated at a current, doesn't mean it can handle it. You need to check RDSon of the FET and ensure that your P=I^2*R losses can be dealt with. Also, robustness against transients is linked to maximum Vgs of the FET, not current rating. If you are expecting high transients, then use a snubber.

    Steve
     
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