• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 28 subscribers
  • Views 101 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.

DRV8434SEVM: EVM recommended current draw

T NF
Prodigy 50 points
Part Number: DRV8434SEVM
Other Parts Discussed in Thread: DRV8434S, , DRV8711

Hello, I am operating a DRV8434SEVM at 48V and have noticed that the DRV8434S IC is quite warm measuring greater than 140F when the H-bridge is off (Thermal Imaging camera used for temperature measurement).  The external 48V power supply indicates a current draw of 20 milliamp when the EVM is in this state.  The device is set to latch all faults other than Stall and none of the Fault indicators are indicating any issue when SPI is active.

Can you advise if these observed conditions are considered normal and the EVM can be continued to be used. 

Thank you.

  • 0
    TI__Guru 54675 points

    Hello!

    This is definitely not expected behavior.  I also would not recommend running the device continuously at the recommended max. voltage.  It appears you  have damaged the device.  Does it spin a motor? 

    If you need to run at 48V, I would suggest considering a device with some margin like the DRV8711.  

    Regards,

    Ryan

  • 0
    Prodigy 50 points

    Ryan, thanks for the reply.  The EVM will spin a motor although the motion is inconsistent.  

    Can you elaborate further or contact me as regards the advice on the 48V.  

  • 0 in reply to T NF
    TI__Guru 54675 points

    Hello again,

    If the abs. max is exceeded, 50V, damage will occur to the device.  There is not much margin at 48V unless the supply is very tightly regulated.  

    Regards,

    Ryan