One driver for paralleled Mosfets?

[Wrydog]

If you have two+ Fets in parallel, can you typically drive them with the same gate driver? What are the limiting factors?

[danadak]

Its all about gate charge and available driver current and Pdiss and frequency.

There is nothing preventing, proper design done, to drive more than
one MOSFET from the same driver. Problem is one MOSFET may have
significant different Cg than another from different batches, so you need
to look carefully at case where one fet lags another in the switching of
load.

Especially load and safe area, thermal, considerations.

Many welder designs parallel MOSFETs for cost considerations.

There are many good ap notes out there from ST, IR, IXSYS..... on driver
design considerations.


Regards, Dana.