high current in digital out

[v1212800]

Hi,

I want to control a MOSFET via a digital out line without any optocouplers or MOSFET drivers. My question is: If the MOSFET is overheating, can I damage my Digital I/O Card with a high current back to my computer or is there something to protect for those mistakes? I use a SCB-68 Connecot Block.

Thanks

Tim

[AnalogKid2DigitalMan]

If your MOSFET is overheating, it could eventually break down and pass a voltage to the gate that may damage the digital ouput. Maybe a diode between the digital out line and the gate to block reverse voltage or a 5.1V zener on the digital out to conduct to ground. Have you verified that the specs of the MOSFET are sufficient for your application? Inadequate heatsinking? Personally, I would use an opto or galvanic isolation if the risk warrants it.

[v1212800]

Hi,

thanks for the answer, indeed, I will use now an optocoupler for protection.

Thank
Tim