• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 31 subscribers
  • Views 152 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DRV401: will the DRV401 chip experience electrical offset when subject to a 150A 100us current shock? and what is the offset amount?

Jiawei Hu1
Expert 5085 points
Part Number: DRV401

Hi team,

will the DRV401 chip experience electrical offset when subject to a 150A 100us current shock? and what is the offset amount?

Thanks!

Jiawei

  • 0
    TI__Genius 12930 points

    Hello Jiawei, 

    I am looking into this and I will provide you an update tomorrow (5/15).

    Thank you for your patience, 

    Joe

  • 0 in reply to Joe Vanacore
    TI__Expert 5085 points

    Hi Joe.

    Could you give feedback asap, byd are pushing on this.

    BR

    Jiawei

  • 0 in reply to Jiawei Hu1
    TI__Mastermind 28840 points

    Hello Jaiwei,

    This will be heavily dependent on the magnetics used as the offset will be from the saturation of the compensation core. The softness of the core material, the permeability, mechanical design and the compensation coil number of turns all play a factor of this.

    If the transformer effect of the core compensation windings and the primary have good frequency response then this would be the limiting factor as the compensation driver will allow the current to flow. 

    The limitation may come on your Rs used to measure the current not allowing the current to flow.  Also depending on the Rs and the number of turns on the compensation coil the current may be limited.  

    Recall the compensation current will be limited by the voltage on the H-Bridge driver that is connected to the supply voltages.  So like above the resistance of the coil + Rs will limit the current.  

    Regards,

    Javier

  • 0 in reply to Javier Contreras4
    TI__Expert 5085 points

    Hi Javier,

    Thanks for your reply. Could you kindly help on below question? Thanks!

    It is not mentioned above that after a large impact current exceeds the range, the current is removed, whether the zero-point electrical offset of the chip is affected. Please help to ask again, after a large current exceeds the range, the current is removed. In addition to the zero-point offset of the magnetic core, will the zero-point electrical offset of the chip also drift to a small extent?

    BR

    Jiawei

  • 0 in reply to Jiawei Hu1
    TI__Mastermind 28840 points

    Hello Jaiwei,

    The electrical offset of the DRV401 is not impacted as it does not have magnetic components.  The offset of the probe could be impacted. This is normally less of an impacted as the probe is constantly being excited in both saturation polarities.  This will depend on the material used on the probe.

    I mentioned the frequency as this will impact on the overcurrent condition if the compensation current is limited causing the magnetic core to saturate.  

    This can easily be tested and confirmed by testing one DRV401 in a control core(A) and probe(A).  The moving it to another core(B) and probe (B) and saturating the core (B) and probe (B) and confirming the offset does happen.  Then go back to core (A) and probe (A) and confirm the original control values are repeated.

    Keep in mind that components like capacitors and resistors are not always non-magnetic and can get magnetized as well.  The proximity to your probe or core could change things.  Also what is the condition after you Degauss the system.

    Regards,

    Javier