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

[Fred Bloggs]

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.