How to use MOSFET as a Switch ? MOSFET as a Switch Explained
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:
• MOSFET - Enhancement Type MOSFET Expl...
2) Depletion Type MOSFET:
• MOSFET- Depletion Type MOSFET Explain...
This video will be helpful to everyone in understanding, how the MOSFET can be used as a switch.
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