DRV8874-Q1: How to choose Cbulk?

Leo Ma

Expert 3706 points

Part Number: DRV8874-Q1

Tool/software:

Hi Expert,

Have a nice day! I have question need your professional support:

About Cbulk, datasheet provides some advices about how to choose it.

My question is could you give some recommended value of this Bulk Capacitance based on the application scenario:

VIN: 13.5-16V, Iout Max: 3.8A

Thanks!

Best Regards,

Leo Ma

1 month ago

+1 Murugavel4637 1 month ago

TI__Mastermind 44825 points

Hi Leo,

Thanks for your question. See these E2E posts, one, two and three.

Leo Ma said:
My question is could you give some recommended value of this Bulk Capacitance based on the application scenario:

VIN: 13.5-16V, Iout Max: 3.8A

This would depend on the power supply capability and the impedance between power source and the motor driver. Using the thumb rule probably a 220 uF (or 2x 100 uF in parallel) would be necessary.

Regards, Murugavel

0 Leo Ma 1 month ago in reply to Murugavel4637

TI__Expert 3706 points

Thanks!

0 Murugavel4637 1 month ago in reply to Leo Ma

TI__Mastermind 44825 points

Thank you!

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DRV8874-Q1: How to choose Cbulk?