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DRV8880: Small current limit setting

Part Number: DRV8880


Customer thinks to use DRV8880.
Condition is full step and 20mA full scale current.
Is it possible?

DRV8880 operates the current setting value 71% with full step.
For the reason, I think that 30mA full scale current setting is better.

The concern is accuracy of the current limit detection.
I think that the accuracy is bad from Figure 10.

If it is possible on specification, I tell customer to try at EVM.

Best regards,

  • Hi Shimizu-san,

    Yes, this is possible. For such low current, consider using a 5 Ohm resistor and a VREF of 1V (IFS = 0.30V, xISEN Full scale Trip voltage = 150mV). Power through the resistor is 2mW at 20mA.

    The resistors can be changed on the EVM.