On Mon, 10 Oct 2005 11:50:18 -0700, the renowned Jamie
>> I would like to drive an IGBT from a microcontroller (CMOS).
>> Is there a driver circuit that can outputs around +15v (on) and a -5v (off)
>> for switching frequencies around 40Khz.
>> I think -ve voltage supply is avaliable
>> What is this type of circuit called?
>i really don't understand why you need that?, normally pulling the
>gate low will do how ever if you insist.
For big IGBTs, some negative gate drive is an advantage.
> simply provide a +15 volt source via a resistor sufficient enough
>to drive the gate in the on mode, use something like a simply NPN
>transistor to pull it low at the gate to shut the IGBT off, put the
>emitter to a - supply.
> since these Gates are H Z, the - source does not need to be much.
>using either a high freq OSC from something simple like a 555 or
>an output from the MC, you can generate - voltage via a Cap and diode et..
> the base of the transistor will get switched from the MC signal line.
There's a lot of capacitance.
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