Looking at the data sheet for my IRFP4110PbF, I see under the total Gate charge (Qg) is 210nC, if the drain current is 75A and the voltage on the gate is 10V. since 10V is a pretty normal Gate voltage and 50V is close enough to my 48V, I need to know how the drain current will affect the gate charge. For example, what if Id was 120A? What would Qg be?
these documents:
http://www.irf.com/technical-info/appnotes/mosfet.pdf
http://www.irf.com/technical-info/appnotes/an-944.pdf
address gate charge and indicate that a different Vds will affect the gate charge but fail to mention anything about how the drain current will effect gate charge.
...
It seems rather silly now that I think about it, because in order for there to be any drain current, the device has to be already switched, so drain current shouldn't matter I suspect, then why do they specify Id of 75A in the datasheet under Gate charge?
these documents:
http://www.irf.com/technical-info/appnotes/mosfet.pdf
http://www.irf.com/technical-info/appnotes/an-944.pdf
address gate charge and indicate that a different Vds will affect the gate charge but fail to mention anything about how the drain current will effect gate charge.
...
It seems rather silly now that I think about it, because in order for there to be any drain current, the device has to be already switched, so drain current shouldn't matter I suspect, then why do they specify Id of 75A in the datasheet under Gate charge?