mosfet Driving LED strip from microcontroller


Posted on Feb 7, 2014

A strip of LEDs from a microcontroller using PWM to control the brightness. The strip I have takes about 1. 5A at 12V. I`m only familiar with purely low power digital electronics so wanted to check if these assumptions are correct and get any advice :- However looking at the spec of the various MOSFETs I can buy it looks like any that can pass this amount of current


mosfet Driving LED strip from microcontroller
Click here to download the full size of the above Circuit.

require considerably more than 3. 3v I can get from my microcontroller to turn on fully. So am I best to have a small NPN transistor switching 12v to the input of a mosfet to control the actual LED strip (Sorry I can`t draw a diagram on this computer but can add one later if needed) Are my assumptions correct, and does anyone have any advice or a better way I`d also be interested in recommendations for suitable parts although that`s not my main question. (Edit: I looked for other posts that answered this and didn`t find anything that was quite what I wanted, if someone has a link to a duplicate then please post it and I`ll happily close the question).




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