Hi,
my customer is driving stepper motor with DRV8823.
They can drive the motor well at normal temperature, but need to wait for a while for the motor to run at -5C with the same control signal.
They found the problem is caused by delay power up of ABVREF, CDVREF, which are both from V3P3.
At 25C, ABVREF, CDVREF powered up at the same time with 24V at VM.
At -5C, ABVREF, CDVREF powered up 30 seconds later than 24V at VM. Which caused the stepper motor not rotating at beginning.
Schematic is as below:
Why V3P3 will delay such a long time at -5 degree C?
