Other Parts Discussed in Thread: DRV8834, , DRV8834EVM
Referring to this former post:
my customer has provided these additional comments:
For their stepper-motor: Initially they worked with the DRV8834EVM, later on they worked with the DRV8836 on their own PCB and found 24% lower torque compared to the DRV8834. This came as a surprise as the two devices have comparable RDSon values.
As to measuring the RDSon: The VCC is a stable 3.3V in their design. The voltage drop was calculated as the maximum available voltage (2*3.3V=6.6V pk-pk) minus the measured phase voltage. From this value they calculated the RDSon.
Please also find a comparison for the DRV8834 vs. DRV8836 current where the DRV8836 draws less current.
Please comment as to the possible root-cause for the lower torque of the DRV8836 vs DRV8834.