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Which of the following are the characteristics of power MOSFET? 1) Fast switching speed 2) Low bandwidth 3) Simple biasing 4) Ease of application and repair 5) High gate drive power

Which of the following are the characteristics of power MOSFET? 1) Fast switching speed 2) Low bandwidth 3) Simple biasing 4) Ease of application and repair 5) High gate drive power Correct Answer 1, 3, 4

Concept:

  • Power MOSFET is a device that evolved from MOS integrated circuit technology.
  • It was developed by redesigning lateral MOSFET to increase their voltage blocking capacity.
  • A power MOSFET using VDMOS technology has a vertically oriented three-layer structure of alternating p-type and n-type semiconductors as shown

Important Points

Important differences between BJT and power MOSFET are as follows:-

  • Unlike BJT a power MOSFET does not undergo a second breakdown.
  • The primary breakdown voltage of a MOSFET remains the same in the cutoff and the active modes. This should be contrasted with three different breakdown voltages (VSUS, VCEO & VCBO) of a BJT.
  • The ON-state resistance of a MOSFET in the ohmic region has a positive temperature coefficient which allows paralleling of MOSFET without any special arrangement for current sharing. On the other hand, Vce(sat) of a BJT has a negative temperature coefficient making a parallel connection of BJTs more complicated.

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