There is a diode in parallel with the coil to deal with the voltage transients after the coil opens. I've had a scope on the drain of the FET, but I didn't notice any large transients.
Another note:
An exact replica of this application is currently in place using MOSFETs as gate drivers. The drain of the FET is connected to 12V via a 10K resistor. The gate of the power FET receives its signal from the drain of the previous FET. Same coil, same voltages. These FETs do not...
When I set up the gate drivers and the power fet on the bench, I don't have problems. I can run it all day long and not heat up. The problem occurs when the FET is operating with the coil.
Heres the overall setup:
4 batteries in series provide 48 volts. The 48 volts powers the coil. The low...
I am using a gate driver as an interface between a power FET and a microcontroller. The power FET controls a coil that operates at 48V. The gate driver is powered by 12 V with input voltages that are TTL compatible. Any ideas why the gate drivers could be getting hot and exploding? They are...
I am building a controller for a retarder. A power MOSFET is being used to control whether the retarder is on or off. I need to connect a large gauge wire, I've been using 10 gauge, to the MOSFET which is in a TO-220 package. I've contacted digikey, newark, and mouser about connectors which...
