MOSFET
- The
MOSFET is a majority charge carrier device.
- It is a voltage controlled device.
- The input voltage controls the output current therefore It is a characterized
by trans conductance.
- The input drive circuit of MOSFET is much simpler than
the transistor due to high input impedance.
- It has a positive temperature co –
efficient of the resistance.
- The secondary breakdown and hot spot does not occur
in the MOSFET.
- The gate current for the conduction of MOSFET requires only for
short duration in order to charge and discharge of self capacitance.
- The MOSFET
has no storage and delay time therefore its switching speed is higher than that
of transistor.
- The trans conductance of the MOSFET increases with increase in
the current.
- The on state resistance of the MOSFET increases with increase in
current as compared to transistor.
- The peak current as well as continuous
current rating of MOSFET is higher than that of transistor therefore the
junction temperature does not increases at higher current rating.
- The safe
operating area of MOSFET is better than that of transistor.
- The conduction
voltage of the MOSFET is higher than that of transistor and it increases as the
voltage rating increases therefore the conduction losses in the MOSFET is
higher than that transistor at rated current.
- The MOSFET is more efficient
particularly at high frequency whereas it is less efficient at low frequency
due to higher switching losses.
- The MOSFET is ruggedness, cost effective and
reliable than transistor even at lower frequency operation.
- The MOSFET is less
sensitive to voltage spike than transistor.
TRANSISTOR
- The
transistor is a majority as well as minority charge carrier device.
- It is a
current controlled device.
- The input current controls the output current
therefore it is characterized by current gain.
- The transistor remains in on
state if the base current continuously flows through it.
- It has a negative
temperature co – efficient of the resistance.
- The secondary breakdown and hot
spot may occurs in the transistor.
- The switching speed of the transistor is
lower than that of MOSFET.
- The gain of the transistor decreases with increases
in the current.
- The junction temperature of the transistor increases with peak
and continuous current.
- The conduction losses in the transistor are lower than
that of MOSFET due to low on state resistance.
- The switching losses in the
transistor are lower at low frequency therefore it is suitable for lower
frequency operation.
- The transistor is less sensitive to voltage spike than
MOSFET.
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