How to use MOSFET as a Switch ? MOSFET as a Switch Explained

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In this video, how the MOSFET can be used as a switch is explained.

Timestamps for the different topics covered in the video:

0:00 Introduction
0:22 MOSFET vs BJT as a Switch
4:22 Why Enhancement type MOSFETs (E-MOSFET) are used as a Switch
5:37 E-MOSFET ( N-channel MOSFET) as a Switch and Design Consideration
12:38 P-channel MOSFET as a Switch
14:10 Total Gate charge of MOSFET and its impact on Switching Speed of MOSFET

The MOSFET as a Switch.
Similar to BJT, the MOSFET can also be used as a switch. But the MOSFET has a certain advantage over BJT Switch.

Advantages of MOSFET as a Switch over BJT:
1) The MOSFET is easy to drive than BJT (Since it is voltage controlled Device)
2) At high frequency, in continuous switching applications, the MOSFET is more power-efficient
3) MOSFET is more thermally stable than BJT

Generally, the Enhancement type MOSFET is used as a switch. The Depletion type MOSFET (D-MOSFET) is normally ON device. That means even when voltage Vgs is zero, the MOSFET is in the ON condition and the current is flowing through the MOSFET.
While Enhancement type MOSFETs (E-MOSFET) are normally OFF devices and their transfer characteristics are more suitable to use them as a switch.
When the MOSFET is used as a switch, then it is operated between the linear or ohmic region and the cut-off region.

In this video, how n-channel and p-channel MOSFETS (E-MOSFETs) can be used as a switch is explained along with design considerations. And during the design, what factors in the datasheet should be taken into consideration is also explained.

The link for the other useful videos related to MOSFET:
1) Enhancement type MOSFET:

2) Depletion Type MOSFET:

This video will be helpful to everyone in understanding, how the MOSFET can be used as a switch.

#ALLABOUTELECTRONICS

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Timestamps for the different topics covered in the video:
0:00 Introduction
0:22 MOSFET vs BJT as a Switch
4:22 Why Enhancement type MOSFETs (E-MOSFET) are used as a Switch
5:37 E-MOSFET ( N-channel MOSFET) as a Switch and Design Consideration
12:38 P-channel MOSFET as a Switch
14:10 Total Gate charge of MOSFET and its impact on Switching Speed of MOSFET

ALLABOUTELECTRONICS

EXCELLENT video about MOSFET's and BJT's. I had many questions about sizing an N-channel mosfet for driving some LED's and a small vibrator motor. Comprehensive discussion....I watched the entire video 2 times. Excellent job and thank you for your help.

dudefishgelf

Thanks for showing all the graphs that relate the resistance to voltage and switching time and current

XDTuber

You explain better than all of my teachers

yacineyaker

Thanks for the great videos, these are of the highest quality I've found so far. Please check the MOSFET symbol at 14:22, SS/B should be connected to S, not D. Otherwise, again a fantastic video.

GergelyMelis

Even though we say MOSFETs are gate voltage driven, for high frequency operations we need to look at gate current as well.

apurvmj

Pls continue this series as in new syllabus mosfet and it's application and it's ac DC analysis is included 👍🙏🙏🙏

guruprasaddeshpande

best video on whole youtube.
keep it brother and provide content like this only.

solidname

Thank you very much for this easy to understand and very helpful tutorial...

sameerk

In addition, this video describes a low side switch. A N mosfet can also be used as a high side switch, but will need a isolated gate driver.

Also: a mosfet always has a body diode, which will conduct if the current is reversed form drain/source to source/drain (inductive spikes will pass)

MasterIvo

Can the pull down resistor be anywhere from 10K to 100K ? Great informative video.

dalek

Thank you souch for detailed information 🙏

jyotihebbar

hey man i love ur videos theyre info packed easy to understand what ur tryin to explain and the graphics are quality to, can i please make one very respectfully intended suggestion?? if u spoke a tiny bit clearer ppl wouldnt have to rewind and it would help show how intelligent u obviously r-the way u pronounce stuff makes a huge impression on ppl, helping business communicate with other businesses basically with the most profit in the end is my thing

dirtracer

One question - the pull down circuit has been shown to be just a simple R connected to ground. But when the control circuit provides a high on gate terminal, wont this resistor R provide a path to the ground always sinking current, creating power loss? Or is this R very high so this current is minimal ? In practice is the pull down circuit this simple?

harshatpant

Dear Sir,
in slide at 13:19 you draw the internal of the MOSFET same as previous slide(12:50). But the D and S are swapped?
Can you explain if it is correct or no, and if, what should be corrected?

YTspeurder