Hi,we recently use drv8343s for PMSM sensorless control of a 24V system.
However, the driver in the test is easy to be destroyed.
We use the infineon Mosfet of IPI120N06S4-02, whoes Cgd is typically 15nC.
We start with 200mA IDRIVEP, and 3us TDRIVE.
I find the limit value for SHX and DLX as below
Does it mean that if I choose a big IDRIVE, it will easliy cause a big dv/dt, which will cause high spike at SHX and DLX?
It seems that there is not that much region for SHX and DLX .Some other drivers which use external bootstrap has a big limit for SHX and DLX,like 60V.
Is the voltage spike at SHX and DLX the most common reason for the damage of smart driver?
So we must slowly turn on the MOS to make sure the spike at SHX and DLX not more than Vm+7V? It will increase the power loss of MOS a lot.
Regards
Arrow