I am trying to regulate a "low current" (20A) by the controlling the voltage between the source and the gate of a MOSFET SiC. I want to make the MOSFET work into this region :
Nevertheless it is not able to regulate 20A. The setup is the following :
I set the power supply in voltage mode and limit it current to 21A. At the beginning I set the voltage VGS to 15V. And I slowly decrease the voltage VGS to hope that at a certain voltage it will limit the current to 20A. At a certain VGs around 3V, the current starts to oscillate. I was not expecting this. I was thinking it will stop conduct if the vgs was too low but I wasn't thinking that it will oscilatte. Then toward 2V, it stops conducting.
Is it normal to see the current oscillating when Vgs is near the threshold voltage ?
Thank you :)