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DRV8824: Accuracy of chop current

Part Number: DRV8824

Dear Specialists,

My customer has aquestion of chop current.

I would be grateful if you could advise.

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The chop current is determined by equation (1) on page 12 of the data sheet.

Ichop=VREF(x)/(5xRsense)

(1) We would like to know the accuracy of chop current when VREF is 1V, what percent.

The recommended range of VREF is 1 to 3.5V, so We'd like to know the accuracy at 1V.

Because we expect the accuracy to be the worst at 1V,

(2) According to the recommended operation condition on the data sheet P.4, it is commented that the accuracy will deteriorate when VREF is used at 0 to 1V.

What is the accuracy at this time, what percent.

When VREF is constant, we predict that the lower the VREF voltage, the worse the accuracy.

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I appreciate your great help in advance.

Best regards,

Shinichi