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DRV8426E: ΔITRIP

Yuta Nishie
Genius 5015 points
Part Number: DRV8426E

Hi,

Our customer is considering using Iout=500mA and VVM=12V. The data sheet shows ΔITRIP when VVM=24V, but is it safe to assume the same value when VVM=12V? (When Iout=500mA, ΔITRIP=±10%)

Best Regards,

Nishie

  • +1
    TI__Mastermind 45215 points

    Hi Nishie-san,

    Yes it is safe to assume the same ΔITRIP accuracy for 12 V VVM. However one of the key requirements is VVM > IFS (ITRIP) * DCR (DC resistance) of the Stepper coils with some head room voltage for proper current regulation and achieve proper current waveform. If not the target current can never be reached is VVM < IFS * DCR. This is general requirement for chopper current regulation regardless of the supply voltage. To make this even more precise VVM > (IFS * DCR) + VBEMF. When motor runs faster back EMF is higher so the VVM needs to be higher including VBEMF to be able to push through target current through the stepper coils.

    Regards, Murugavel