Hey all,
I am using the DRV8842eval board, and I just wanted to mention an issue and ask a question regarding some current railing that I am observing.
One issue I had with this board is that it doesn't have a protection diode. I switched the polarity on the power and poof there goes my chip. I have since replaced the chip without attaching the heat sink. I was wondering why TI wouldn't include a diode for stupid mistakes like these...
On another issue, I have had problems running this drive at low currents. It seems that if I try to drive the current to low PWM, it always switches to a 0.05 A and I can't seem to drop it below that level, even if I change the Vref using the application. That is concerning to me because I am trying to control an underactuated double pendulum problem, and .05A is a lot of torque on the system which ends up oscillating quite hard.
Thanks,
Ahmad