High Current Driver

D

Thread Starter

DoGer86

In need of one high and one low side big MOSFET any as IXFN132N50P3 (like this HiPerFET) 500V 18nF gate 1,16-ohm gate input resistance.


I'm thinking of using anything or something with a bigger current and simpler driver. What would you recommend for this size of MOSFET?
 
FAN7392 Data sheet on one option. This is not isolated so the controller (PWM) needs to be sitting on the Source of the bottom FET.
Do you need isolation?
View attachment 80
You do not need isolation between the controller, FAN7392 driver and the bottom side FET Q2; high side FET Q1 drive control is internally isolated in the driver itself. FET drive energy for Q1 is supplied to Cboot through Dboot when Q2 is ON. DO read the application information beginning on page 14 in the data sheet; PCB layout to minimize negative spikes on pin 5 is important. (An internal PCB ground plane can dramatically reduce circuit inductances, but are seldom used due to the extra cost.) If all else fails, a closely spaced SiC Schottky diode between pin 2 (anode) and pin 5 (cathode) would solve the negative spike problem (a fast recovery silicon diode may work too, and be lower cost).
 
You do not need isolation between the controller, FAN7392 driver and the bottom side FET Q2
I don't know if DoGer86 needs isolation or not. I asked because working right on the power line can be exciting. I am using isolation because the computer (PWM) is sitting on ground and the FETs are on the power line.
 
I don't know if DoGer86 needs isolation or not. I asked because working right on the power line can be exciting. I am using isolation because the computer (PWM) is sitting on ground and the FETs are on the power line.
I don't know if DoGer86 needs isolation or not. I asked because working right on the power line can be exciting. I am using isolation because the computer (PWM) is sitting on ground and the FETs are on the power line.
Well, yes, that does make quite a difference. Isolated communication between the controller and FET driver would then be necessary, as the driver needs direct connection to the FETs.
 
Could you potentially employ a bootstrap on the high side? Basically, does the MOSFET turn off periodically and enough for the bootstrap cap to potentially recharge?
 
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