Re: IGBT's in Place of MOSFET's

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "gtyler" <gtyler-at-drummond-dot-org.za> 

Look at the gate capacitance of the respective devices and also the
miller capacitance. IGBT's are usually much less of a load than fets,
even for higher current ratings. What frequency are you running at?
Igbt's can be less efficient at higher frequencies due to tail current
increasing switching loss, but have less of a problem if the load is
capacitive, which can kill fets.

George

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 31, 2004 8:23 PM
Subject: IGBT's in Place of MOSFET's


 > Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
 >
 > Hi,
 >
 > Today after blowing fets in my H bridge due to a bad tuning pot on a
TL494,
 > Steve Ward suggested that I could use some IGBT's instead of the fets.
I
 > have a good supply of IGBTs and they are beefier then the mosfets I
was
 > using.  My question is, how can I be sure that four of these IGBT's
isnt
 > going to overload my gate drive IC's?  I have 30N6S2 IGBT's and my
current
 > H bridge is full of 44N50's.  Does anyone have any advice?
 >
 > Regards - Jim Mitchell
 >
 >
 >