The motor current can be monitor by the IPROPI pin voltage. The IPROPI voltage is the voltage proportional to
the motor current. A more detailed explanation on how current regulation and sensing can be found on section
8.4.3 of the datasheet.
DRV8251EVM and DRV8231EVM:
Features integrated current regulation. This is implemented by comparing the analog input VREF and the
voltage on the ISEN pin, which is proportional to motor current through an external sense resistor. The ability
to limit current to a known level can significantly reduce the system power requirements and bulk capacitance
needed to maintain stable voltage, especially for motor startup and stall conditions.
Current regulation for both variants will be dependent on Itrip, a set threshold which once exceeded will cause
the device to enter current regulation. This threshold can be adjusted by the VREF potentiometer and follows the
following equations:
Figure 5-4. Current Regulation Equations
For more information be sure to refer to the
of the device installed on the EVM.
Operation of the EVM
8
DRV8251/AEVM User's Guide
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