DRV8889-Q1: Rref1 and Rref2 for Vref

Jimmy Gong

Expert 3600 points

Part Number: DRV8889-Q1

Hi team,

Quick question here that how can I judge the value of Rref1 and Rref2 for Vref?

the recommend of two is less than 50-kohms.

BR,

Jimmy

over 2 years ago

0 Ryan Kehr over 2 years ago

TI__Guru 55615 points

Jimmy,

Use values of 10k or greater and you will be find. It is just a resistor divider circuit so you can adjust VREF based on your desired full scale chopping current needs. Calculations are in the datasheet for current as it is related to VREF.

Regards,

Ryan

0 Jimmy Gong over 2 years ago in reply to Ryan Kehr

TI__Expert 3600 points

Hi Ryan,

Where can i find the Calculations ? I just find low pass filter R-C time of VREF.

BR,

Jimmy

+1 Pablo Armet over 2 years ago in reply to Jimmy Gong

TI__Mastermind 37683 points

Hi Jimmy,

The full scale current calculation is in page 20 of the datasheet.

Regards,

Pablo Armet

0 Jimmy Gong over 2 years ago in reply to Pablo Armet

TI__Expert 3600 points

Hi Pablo,

thanks for your help!

Jimmy

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DRV8889-Q1: Rref1 and Rref2 for Vref