IGBT gate resistor for switching application

[nothing909]

Homework Statement
I have a 560 ohm gate resistor on an IGBT. Usually an IGBT doesn't require a gate resistor as it already has a high impedance of its own, but I'm told that for switching applications a gate resistor can be beneficial.

The attempt at a solution
If there is a gate resistor, will it not slow down the switching speed of the IGBT? Why then would I require a resistor at the gate?

 

[Windadct]

The gate has capacitance, very low resistance can cause a gate ringing due to parasitic inductance in the gate circuit. The resistor impacts many factors, it may be necessary to slow the IGBT down to reduce di/dt or EMI, to limit the peak current from the driver.

Some various references - there is no one answer - it is worth reading all of them through. But nothing beats blowing a few up and then figuring out why...
ON Semi
Infinion / IR
http://www.ppi-uk.com/wp-content/uploads/AN-7003_Gate_Resistor-Principles_and_Applications_rev00.pdf

These references above are typically for larger IGBTs - but your 560 ohm seems very high, I have not seen an IGBT using Rg that high. I just looked up a small IGBT 600V/30A and the Rg was 22 Ohms.

As a rule of thumb we start with 150% of the value used for the IGBTs characteristics in the Datasheet, as these tend to be ideal conditions and done to make the IGBT switching look as good as possible - but realistic.