Discussion
Why is a MOSFET's gate drive voltage usually well above its threshold?
Answer: B
The channel is enhanced progressively, so driving the gate to ten volts rather than to the four-volt threshold gives a much lower on-resistance and far less conduction loss - data sheets quote on-resistance at a stated gate voltage for exactly this reason. Threshold spread and the body effect are real but secondary, and a higher drive voltage does not itself charge the gate faster, since the charge required rises too. Driving a switch hard rather than merely past its threshold is the difference between a device that runs cool and one that needs a heatsink.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development