• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 369 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8353: For dual-supply architecture, any power sequencing requirements?

Michael Shonle
Prodigy 220 points
Part Number: DRV8353
Other Parts Discussed in Thread: , LM5008A

Hi, we are looking at using the DRV8353 for driving a brushless DC servo motor, at 56 volts, and would like to use the dual-supply design to reduce consumption.  We have a 15 volt supply, but it doesn't start up until a bit after the 56-volt rail is fully up (it has a soft-start feature). (the 15-volt is derived by stepping up a 5 volt regulator which is stepped down from the 56-volts).

The datasheet doesn't mention whether the Vvdrain pin can be powered if the Vm pin isn't (and vice-versa, though not a situation we'll run into).

As a potential alternative, would it work to use the DRV8353R version and use the built-in regulator to generate the 15-volts?  Would this be guaranteed to be safe?

Thanks for any help or guidance.

  • 0
    TI__Genius 12231 points

    Hi Michael, 

    Thank you for your questions. 

    Allow some time to look into these possibilities and provide a recommendation.

    Best Regards.

    -Joshua

  • 0
    Prodigy 220 points

    Hi, just wanted to follow up and see if you've found out anything?

    Thanks!

  • 0 in reply to Michael Shonle
    TI__Genius 12231 points

    Hi Michael, 

    I do have an update:

    Michael Shonle said:
    The datasheet doesn't mention whether the Vvdrain pin can be powered if the Vm pin isn't (and vice-versa, though not a situation we'll run into).

    To be safe and ensure an undervoltage fault doesn't trigger or  generator mode occurs, I would recommend powering on VM before VDRAIN; but other than those concerns, there should be no other problems if VDRAIN was powered before VM. 

    Michael Shonle said:
    As a potential alternative, would it work to use the DRV8353R version and use the built-in regulator to generate the 15-volts?  Would this be guaranteed to be safe?

    Yes, the built-in buck regulator is the LM5008A and should be able to operate as desired as long as the 8353R and LM5008A guidelines are followed. 

    Please let me know if any additional clarification is necessary.

    Best Regards,

    -Joshua