MOSFET Switch

100pcs IRFZ44N IRFZ44 IRFZ44NPBF MOSFET MOSFT 55V 41A 17.5mOhm 42nC TO-220 new original

Mosfet is a metal oxide semiconductor device. It has mainly three terminal – Gate ( G), Drain ( D) and source ( S ). Here gate is isolated from the channel by metal oxide thin layer. A power MOSFET is a voltage controlled device. This MOSFET is used for high-speed switching operations. The switching speed of MOSFET is very high and it has switching time in order of nanoseconds. It also has applications in low power high-frequency converters.

Advantages of using MOSFET instead of BJT is it does not have the problem of second breakdown phenomena as in BJT. MOSFET generates very less heat loss compared to BJT at high currents. So it has high efficiency than other devices. So it is used extensively in power electronics.

Summary table for MOSFET:

Content	Link	Category
MOSFET	MOSFET IRFZ44N IRFZ44 IRFZ44NPBF	IRFZ44N IRFZ44 IRFZ44NPBF
MOSFET	Various MOSFETs	Other types of MOSFETs
Resonance	Series MOSFET And Tesla Oscillator	Free Energy
Pulse	Pulse and Square Wave Generator	Impulse Technology

MOSFET application as a Switch

As above we saw there are two types of MOSFET. Here we know the application of MOSFET using Enhancement type MOSFET. In this circuit, we are using enhancement mode, an N-channel MOSFET is being used to switch the LED or LAMP for ON and OFF. The voltage is applied at the gate of the MOSFET at that condition the lamp is ON. When the zero voltage level is applied at the gate then the device and lamp is turned off (VGS=0. So by this way, we can use MOSFET for switching operation. And MOSFET has a very high switching device.

Here we use Lamp as a simple resistive load and use MOSFET as a switch. But is we want to use inductive and capacitive load then we require some external protective circuits. This protective circuits can be anything simple circuits including free wheel diode etc. Protective circuits are used for protecting MOSFET from damage during inductive and capacitive loads. Hope you understand well about MOSFET switching operation.

Also See: Impulse Voltage Generator - Marx Generator