Hi team,
I’m configuring the DRV8251A peripheral circuit to get correct current regulation after paralleling with my customer, e.g., setting each Itrip=1.5A, and need the total current regulated @ 3A. However, they have get the result that device will regulate below 3A. Since customer use different voltage divider resistor (1% accuracy) for Vref, and different Rpropi to capture the Ipropi, I assume the resistor accuracy will cause different Itrip threshold, and internal MOSFET Rds_on will cause the current flow to two devices unevenly.
I tried to connect the Vref pin together, and use one Rpropi to capture the Ipropi. It seem the device could trigger the regulation threshold correctly: single device tripped @ Vpropi=1.65V, and paralleling devices tripped @ Vpropi=3.3V. Could you please help to confirm if this connection valid in paralleling use case?
BR
Sirui
