MOSFET gate drive circuit

[poseidon_gal]

hey...thanks everyone..for the help..

 

[HINDI]

Hi

what i've understood that u want to build a gate driver using a dicreate componant .

see these links
http://www.irf.com/technical-info/designtp/dt94-12.pdf

http://matthieu.benoit.free.fr/moteur2.htm
salam
hindi

 

[vishakha]

not abe to see the ckt.suggest ckt

 

[kinut]

hi
i want to develop a gate drive circuit to turn the MOSFET on and off. do u have any idea?

 

[southindia]

hi,
i m trying to develop driver circuit for mosfet in pspice simulation, i have no idea to design and what to use.
need help for my project.

 

[RCinFLA]

What MOSFET are you using?

From waveform it looks like MOSFET transition time is not fast enough. 290 Khz is pretty high rate for large MOSFET's.

There is two primary current steps to gate that causes two appearent visible steps in Vgs. First is just charging Cgs to point where, with MOSFET transition time, begins to pull drain down which kicks in a Miller effect multiplier of Cgd capacitance that cause the second gate charge current spike. There is a third part of gate current but it is relatively insignificant to first two. It is the final charging of Cgs once drain has saturated. All this is bundled together in Qg spec by manfacturer. I drive = Qg /desired risetime. At 290 kHz, and a large MOSFET, the current could be quite large, well beyond a irf2110 capability.