Transistor gate driver circuit11/24/2023 If you don’t have a hard or digital copy of the issue, you can find the article on its own. Half the article in Classroom 32, March 2020, was dedicated to explaining what MOSFETs are and how they work so there’s little use covering it twice. In other words, applying the right voltage allows a current to flow. Instead of amplifying current like a bipolar transistor does, FETs and MOSFETs are voltage-controlled devices. MOSFET is an acronym for Metal Oxide Semiconductor Field Effect Transistor. We’ll revisit the theory of MOSFETs first, and expand it with details that were less relevant or just didn’t fit in the space last time, then work through how to drive general purpose and automotive MOSFETs effectively, safely and efficiently. We have a link at the end to an article from a design engineer whose job is to investigate field failures of consumer goods, and while those design oversights are way beyond anything this article could address, it’s a good case in point. While many design oversights may produce a working project, even one that works for some time, incorrect use can still destroy a MOSFET or its control circuitry over time. MOSFETs have some specific advantages as high-powered load controllers, but they aren’t as straightforward as many Internet-published projects portray. However, not all situations the maker finds themselves in use logic levels, and for some makers, it’s the exception rather than the rule. We covered finding and choosing devices that are designed to be switched on from 5V or even 3.3V, with a bit of the theory behind how they work and why to choose logic-level MOSFETs rather than the more common automotive or general purpose versions when using microcontrollers. Using MOSFETs with non-microcontroller voltages isn’t always as easy as the Internet says it is.īack in issue 32, we looked at using MOSFETs specifically with microcontrollers.
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