Driving Eight IRFP064 with SG3525 directly

[xyz9915]

Hi, all
I want to drive eight IRFP064 with SG3525 directly (in each side). Please explain that is there any formula for calculating the number of MOSFET's?
Regards

 

[FvM]

If you already decided about your circuit, why do you ask for a formula?

To keep the 3525 maximum output current, you would have to use rather high ohmic gate resistors (above 100 ohm) at each transistor, resulting in slow switching. This is probably acceptable for a mains frequency inverter. The usual solution for high frequency switching would be to have discrete BJT post drivers, that can supply a sufficient pulse current to charge the gates.

 

[xyz9915]

It is not decided finally to drive eight MOSFETs but in many circuits (available on the net) I noted that, many transistors are used in parallel. Here is an example is attached. But it is requested to define a simple rule/formula for paralleling MOSFETS for SG3525 etc

 

[fsmyth]

Here is an example driving 6 RFP45N06 with an MIC426.
**broken link removed**

 

[nebo123]

xyz995 can you please post the gate driver circuit for SG3525 , how do you make driver (and PWM control) for the 12VDC in and 110 VAC out, what is the power output, and how about type of transformer used for T7 and T5 ? I am interested in complete circuit
IV