Tool/software:
DRV8353F chip, functional motor controller design. Follows EVB nearly 1:1 on the DRV circuit. We did however add gate Zenors to clamp any voltages over 15v. SH to Gate and VSS to Gate for high and low side respectively. Without these, high powered motors WOULD pop the driver(actually the same fault and power draw as described below). We are using a boost regulator to power VM. At the time of this test VDRAIN was only 18v. VM was 12v. NO load on the motor channels. Test was a direct short from A to B channel (C was not active). The drivers are immediately dying on channel short.
TOLL mosfets, 105ns, approx 1.2mohm RDson(eg very high powered). Expect full load to run at 150 amps continuous/300amps peak, have tested to 60amp up to this point.
Drive Control Register 0x420
Gate Drive HS Register 0x333
Gate Drive LS Register 0x033 on one test and 0x133 on second test.
OCP Control Register 0x067
CSA Control 0x200
FAULT and GDUV flags after driver dies. Power on reset does not clear. Driver pulls ~100ma after failure.
If you could point out my mistake in settings and/or recommendation on what to look at in our design.
Based on the EVB I was expecting this to be a nothing test. Shorts across channel, shorts to GND, shorts to PWR/VDRAIN.
Any help would be appreciated.
