Ok so I have burned about 10 MIC4605 (Datasheet here ) gate drivers this weekend. I am unsure as to how they should be PROPERLY wired.
Also have burned 8 out 10 MOSFETS (Datasheet Here )
Page 1 of the datasheet shows a typical application which is interesting because the motor I am using is 140mA @12V
So i figured this must be some sort of circuit diagram where "things are assumed" like schottky Diodes. After some research I found this on Microchips own website and the funny thing is the circuit diagram looks a lot different than the datasheet.
So now I have this wired up and I am down to 1 Gate driver left alive after burning 9. This circuit seems to work. I am not using a 24V bus, My motor and my gate driver are both being fed by a 12V coming from my power supply. In the circuit above I am not using the lowside mosfet, instead I am just testing the high side mosfet and my motor's other lead goes directly to ground.
This works just fine at 12V and I am PWM'ing perfectly fine and works well, until I turn the voltage up to 16V and then my driver dies.
My only guess is that BACK emf becomes too large and kills something, but I have all the diodes in the schamtic in their rightful place..
I am PWModulating at 32Khz.
My ultimate goal is a Full Bridge Motor driver with all N-channel MOSFETS and having atleast 2 Mosfets in parallel for each high side and low side, but i cant even get past one mosfet at a conservative voltage.