DRV8889-Q1: Schematic review

Ivy Jin

Expert 4625 points

Part Number: DRV8889-Q1

Tool/software:

Hi team,

Could you please help review the DRV8889A-Q1 schematic and give some comments? Thanks!

In addition, if the nFAULT pin don't be used, it can be left open?

Regards,

Ivy

over 1 year ago

0 Keerthivasan Kumanan over 1 year ago

TI__Mastermind 18755 points

Hi Ivy,

Give me 24 hours to look into this and respond to you.

Best,

Keerthi

+1 Keerthivasan Kumanan over 1 year ago in reply to Keerthivasan Kumanan

TI__Mastermind 18755 points

Hi Ivy,

There are no big issues on the schematic, but here are a few things to consider:

1) Even though nFAULT is not used, it still needs a pullup to DVDD. Right now, the way it is configured is fine; the test point on nFAULT helps for debugging purposes (can trigger on nFAULT falling)

Is the 4.7 uF cap the only bulk capacitance on the board? Do they have any other bulk caps on this board?

Best,

Keerthi

0 Ivy Jin over 1 year ago in reply to Keerthivasan Kumanan

TI__Expert 4625 points

Hi Keerthi,

Thanks for your comments!

There is also a 47uF electrolytic capacitance shared by 7pcs DRV8889A Q1, each DRV8889A - Q1 chip has a 4.7uF capacitance next to it.

Regards,

Ivy

0 Keerthivasan Kumanan over 1 year ago in reply to Ivy Jin

TI__Mastermind 18755 points

Hi Ivy,

See the attached draft of our updated app note "Bulk capacitor sizing for DC motor drive applications":

Bulk Capacitor Sizing for DC MD Apps DRAFT.pdf

Best,

Keerthi

Motor drivers

Motor drivers forum

DRV8889-Q1: Schematic review