Re: Large IGBT need help

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

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

To clarify, the gate charge varies (and its non-linear) with Drain to Source
voltage.
The datasheet will typically give you a Qtotal which is the gate charge
based on some Drain to Source voltage.

The better approach is to look at the graph in the back of the datasheet.
They will give you a plot of Gate Charge vs. Vds of
the device.  You can then extrapolate from there.

The V (potential) as Jim listed is Vgate.

 > The gate charge varies with voltage.  Go look at the datasheet and
calculate
 > the gate capacitance.
 > Use the equation C = Q/V where C = capacitance [farads]
 >                            Q = charge [coulombs]
 >                            V = potential [volts]
 >
 > Regards - Jim Mitchell
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Tuesday, April 13, 2004 9:46 AM
 > Subject: Re: Large IGBT need help
 >
 >
 >  > Original poster: Fucian-at-aol-dot-com
 >  >
 >  > In a message dated 4/12/2004 9:06:06 PM Eastern Standard Time,
 >  > tesla-at-pupman-dot-com writes:
 >  > Even after that,  why do you want to use these.  Save them for
something
 >  > else!
 >  >
 >  > Regards - Jim Mitchell
 >  >
 >  > Hmm what else could i use them for besides a tesla coil?Isnt the issue
 > with
 >  > these IGBTs the factt hat they need alot of current to turn on?What if
i
 >  > give them the cutrrent?How much do they need?
 >  >
 >  > Matt
 >  >
 >  >
 >
 >
 >
 >
 >