Hello everyone!
I am currently working on a new PCB design that needs to drive a DC motor in 2 directions. I came across the DRV8839 and I thought it would be a good fit for the motor. For some background, the motor uses 6V and has 1.9A of stall current. I understand the DRV8839 drives up to 1.8A but as the current is limited, I thought it shouldn't be a problem since the running current is 1.1A. Circuit screenshot attached here.
After I got the boards, I tested the motors briefly and they all worked fine, but when endurance testing them, even after 5 minutes of having it turning-breaking-turning, the drivers died. Some of the smoked a bit, some of them just stopped with no physical manifestation. I have been told that having the VCC at 6V and driving the IOs (IN1, IN2 and ENx) at 3.3V with an MCU is not a good idea since it could lead to latch-up. Is this what is happening? Is there anything else I'm missing?
Thank you,
Bruno