DRV8353: OC Issue

Tool/software:

Team

Customer found the device is failure when doing the pre-short circuit by short wiring between V-W and U-V phases. 

So far, there were 4 devices failure(NO SOA/SOB/SOC output) after doing phase to phase short-circuit on customer's board.

- With A-B-A swap, the system is normally operation with new device.

- Doing the impedance measurement between SOx to GND. no matter NG or Good Part it's about 270K Ohm.

Register setting: 

OCP_MODE: 01b (Automatic Retry)

tOCP_DEG:10b

OCP_ACT: 01b

VSEN_OCP:01b

After doing short-circuit test, below registers are triggered and it indicates FAULT signal.  

CH1: Vgs_W, CH2: Vds_W, CH3: VM, CH4: IV to IW short current

After this waveform, SOA/B/C has no output present. 

Schematic:

MOSFET p/n: MDLT080N017RM

e2e.ti.com/.../4861.Circuit.pdf

Regards

Brian