MOSFET as a Switch

 

We saw previously, that the N-channel, Enhancement-mode MOSFET (e-MOSFET) operates using a positive input voltage and has an extremely high input resistance (almost infinite) making it possible to interface with nearly any logic gate or driver capable of producing a positive output.


We also saw that due to this very high input (Gate) resistance we can safely parallel together with many different MOSFET until we achieve the current handling capacity that we required.

While connecting together various MOSFETS in parallel may enable us to switch high currents or high voltage loads, doing so becomes expensive and impractical in both components and circuit board space. To overcome this problem Power Field Effect Transistors or Power FET’s where developed.

We now know that there are two main differences between field-effect transistors, depletion-mode only for JFET’s and both enhancement-mode and depletion-mode for MOSFETs. In this tutorial, we will look at using the Enhancement-mode MOSFET as a Switch as these transistors require a positive gate voltage to turn “ON” and a zero voltage to turn “OFF” making them easily understood as switches and also easy to interface with logic gates. Read more...

Comments

Post a Comment

Popular posts from this blog

Darlington transistor

Image
  The Darlington Transistor configuration of two bipolar transistors offers increased current switching for a given base current. The  Darlington Transistor  named after its inventor, Sidney Darlington is a special arrangement of two standard NPN or PNP bipolar junction transistors (BJT) connected together. The Emitter of one transistor is connected to The base of the other to produce a more sensitive transistor with a much larger current gain being useful in applications where current amplification or switching is required. Darlington Transistor  pairs can be made from two individually connected bipolar transistors or one single device commercially made in a single package with the standard: Base, Emitter and Collector connecting leads and are available in a wide variety of case styles and voltage (and current) ratings in both NPN and PNP versions. As we saw in our  Transistor as a Switch  tutorial, as well as being used as an amplifier, the bipolar ...
Read more

Used Auto Parts

Image
  Usedpart.us   is a nationwide network that supplies Auto parts leads to salvaging yards, auto parts resellers & auto parts locators with a quality lead like Engines and Transmissions Leads, transfer cases, and axles Leads. Our Objective is to provide Premium leads in this competitive lead generation market with some advanced techniques & tools, we are good at this with vast experience in the Automobile Industry. We closely work with salvage yards, nationwide recyclers, part locators,  Buy Used Auto Parts in the USA ,auto mechanics, garage owners who call us best "Auto Parts Leads Providers in USA. We Generate Auto Parts Leads online with a hassle-free experience. People who are searching for Car parts are captured through our service and channeled to your business as a lead to go after. That's why we re called best auto parts leads providers in the USA."We Generate Exclusive Calls & Leads for Auto Parts like": Don’t have the time, tools or know-how...
Read more