Part Number:DRV8305
Hello,
Im new here . Dont know if Im heard.
I tets the drv83055Q in an automotive application.
UVDD 20 V, have exactly the schematics of the application in the datasheet. PWM Frequency 15.56 kHz
The load is a single motor winding. The current signal is normal at a current below 15 A.
When I increased the PWM pulsewith for driving more current short nFault pulses will happen at about over 15 Amps.
The nFault Low-Pulses had an reaction of switching off the PWMs and slowly increase again until the effect happens again (I believe this coud be OC protection)
Now the error:
When I ignore this behaivior an turn on the PWM pulsewith to higher currents than imediately at about 30 Amps the Driver IC will be damaged by reaction nFault steadyly low, AVDD:UV BITpermanently HIGH,
Hardware AVDD is 0V, nFault OV Communication still works but DRiver is defect. Nothing is to fix.
This effect is repetetively. I crashed two boards.