Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Mosfet for more than 250kHz application..

Status
Not open for further replies.
B

biswaIITH

Full Member level 4
Joined
Aug 23, 2014
Messages
204
Helped
27
Reputation
54
Reaction score
28
Trophy points
1,308
Location
Hyderabad
Activity points
2,907
I am searching for a mosfet that can be used for more than 250 KHz application...What would be the selection criteria??How are the rise time ,fall time, turn on delay time ,turn off delay time related to switching frequency???Is there any empirical formula there that explains the relationship???
 

Hi,

I´d say the criteria depend on your application.
Some are satisfied with (relatively) slow rise rate or fall rate, some extremely fast switching.
Some have a fixed duty cycle of 50% some nedd ON times of only a couple of ns.

--> The developer / engineer should give you the selection criteria.

** But most important will be: voltage and current. **

Then there is the body diode. Usually it is slow compared to the MOSFET.
So if the MOSFET is used in a halfbridge configuration you need take care about diode_reverse_recovery_time also.

Klaus
 

suppose it is used in a fulll bridge application where the maximum duty ratio is 50 percent,how to alculate then??
 

Hi,

maximum duty ratio is 50 percent
Click to expand...
... and what is MINIMUM ON time?

Rise rate?
Fall rate?
Voltage?
Current?
Driver circuit?
...

Nobody of us can know the recommendations...

--> Ask the development engineer.

Klaus
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top