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DRV8847: About Itrip accuracy

Tsukui Yusuke
Guru 21930 points
Part Number: DRV8847


Hi,

Customer wants to calculate the accuracy when Iout set = 500mA.
(Rsense=0.3Ω±1%)

The following formula is described in the data sheet.
We consider Risense and Vtrip accuracy for Itrip accuracy calculation.
Is this way of thinking correct?
Should I consider other output current accuracy?




Regards,
Yusuke

  • 0
    TI__Guru 56650 points

    Yusuke-san,

    Rsnese has 1% error.

    If the Vtrip is set to 150mV. The total error would be 11.5mV (10mV from Vtrip and 1.5mV from Risense).

    If the Vtrip is set to 75mV. The total error would be 12mV (11.25mV from Vtrip and 0.75mV from Risense).