Hi Everyone
I'm trying to drive a coil with an arduino. I'm using IRF3205 MOSFET to control the coil and a gate driver MIC4422YN. Schematic is also attached. Whenever I turn on the coil it looks like the gate latches. The coil stays on and I still have 12V on the gate of the MOSFET and around 3V on the input pin of gate driver despite it being pulled down. Oddly enough I have actually made six of these circuits on PCB and only 3 of them have the problem. I have triple checked and I could find any difference.
I have tried some troubleshooting myself and I found out that without any load the driver won't latch
. I'm using bench lab power supply(3A max) and I've noticed that when I remove the flyback diode the latching is fixed but I need the diode as I want to be powering it with batteries. I have replaced the MOSFET and gate driver multiple times but I don't think they are the problem.
I have also tried putting 1
resistor in series with flyback diode and it help a bit. It would latch just occasionally. The flyback diode I'm using is BYP60A6. If anyone would be able to help I'd really appreciate that