Hello,
We are experiencing some VGS_GDF (Gate Driver Fault) anomalies during EMC Immunity testing of a DRV8714-Q1 based design.
In order to address these anomalies, we need a better understanding of the operation of the VGS monitors during normal operation and how a GDF can be triggered.
The data sheet and the Understanding Smart Gate Drive slva714d application note were reviewed but some details regarding the VGS monitor’s operation were still not clear.
Section 8.3.8.9 of the data sheet contains the following statement –
Is the data sheet basically stating that during the TDRIVE time, VGS monitoring is used for dead time “handshaking” purposes and that VGS_GDF triggering is blanked for the TDRIVE time, but that at all other times, a VGS_GDF can be triggered?
In our case, VGS_LVL is set to 1.0V.
Is it a correct assumption that in static operation (non-switching of inputs), if a gate drive output should be “high”, the VGS monitor is continuously active and will trigger a VGS_GDF anytime that VGS is < 1.0V and if the gate drive output should be “low” a VGS_GDF will occur anytime VGS > 1.0V?
Thank you
