Reg:MOSFET Thermal Behavior control

Status
Not open for further replies.
S

sakthivel.eee

Junior Member level 3
Joined
Jun 19, 2009
Messages
31
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Location
Pune
Activity points
1,518
Hi,

Why there is an capacitor or resistor+capacitor is added between Gate and Drain of the MOSFET when MOSFET is used as Switch. IS it to improve Thermal Behavior. Anyone know about this
 

Why there is an capacitor or resistor+capacitor is added between Gate and Drain of the MOSFET when MOSFET is used as Switch.
Click to expand...
Where do you see this? I don't have it in any of my MOSFET switcher circuits.
 

It's ti reduce ringing on the gate.
 

Ice-Tea said:
It's ti reduce ringing on the gate.
Click to expand...

Could you please explain me how does it reduce ringing. To reduce ringing only we have Gate Resistor right?


It is used in most of the circuits when use MOSFET as Switch and also operating at higher frequencies
 

To reduce ringing only we have Gate Resistor right?
Click to expand...
Yes. MOSFET manufacturers are struggling hard to minimize Cdg and Cgs respectively total gate charge. You really won't want to increase it artificially.

It is used in most of the circuits when use MOSFET as Switch and also operating at higher frequencies
Click to expand...
RC feedback elements are partly used in wideband FET amplifiers. As said, I don't see the purpose in switching circuits. Can you post a reference?
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…