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Re: Driver for IGBT? (-ve off and +ve on from CMOS)

Subject: Re: Driver for IGBT? -ve off and +ve on from CMOS
From: Fred Bloggs
Date: Mon, 10 Oct 2005 19:34:34 GMT
Newsgroups: sci.electronics.basics, sci.electronics.design

Spehro Pefhany wrote:

There's a lot of capacitance.
Gate charge is what you really mean...capacitance can be misleading
because it ignores threshold voltage. After looking at that Fugi
Electric line, it seems they require hundreds of ohms of gate series
damping resistance- because of the bipolar current gain multiplying the
lead inductance reflected into the gate circuit most likely- and this
explains the negative bias requirement, as a lower impedance pulldown
would shunt the Miller transient- at turn-off.


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