N-Drive Module heatsinking

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Joined: Mon Oct 24, 2016 5:07 am

N-Drive Module heatsinking

Post by mickc » Mon Oct 24, 2016 5:19 am


I have 6 Ndrive modules being driven by an Arduino using PWM

These control different lighting circuits which use different voltages & bulb types etc but all need to be dimmed from the one potentiometer.

Lighting types are 5v incandescent, 12v LED strip, normal 2.5v LEDs and 28v incandescent.

By using modifier values in the code i can get the light levels the same, all works great.

The question is, how hot do the MOSFETs get under load? do i need to use a heatsink?

The most each MOSFET will be loaded to is 10A maximum, so half of the rated current of 20A.


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Re: N-Drive Module heatsinking

Post by danieldewaard » Mon Nov 07, 2016 12:27 pm

Hi Mickc,

The MOSFETs shouldn't get TOO hot but obviously it will depend on how much current / voltage is going through it. I would suggest running the MOSFET under load, see how hot they get and then decide if you feel like you will need a heat sink or not. There is no hard and fast rule.

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