hi, i am currently trying to design a Mosfet based switch to protect a load from surge currents, the simulator package i am using is PSPICE.
I need the mosfet to turn on to protect the load from surge currents and turn off once it has reduced the current to an acceptable level of 5 amps.
I am aware a mosfet turns off once VDS> VGS-VTH and turns on when VGS>VTH
however i need to control when it turns off, so far i have only gotten to the point of turning it on, and it turns off by itself after a few ms.
Please help, also if there are any good links showing what i am talking about that you know of please put them in your reply
I need the mosfet to turn on to protect the load from surge currents and turn off once it has reduced the current to an acceptable level of 5 amps.
I am aware a mosfet turns off once VDS> VGS-VTH and turns on when VGS>VTH
however i need to control when it turns off, so far i have only gotten to the point of turning it on, and it turns off by itself after a few ms.
Please help, also if there are any good links showing what i am talking about that you know of please put them in your reply