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DRV5056: Temperature drift problem

Annie Liu
Genius 10295 points
Part Number: DRV5056

Hi Team,

When the temperature is 50 degrees, the output voltage center point voltage has a drift of 100mV compared with 25 degrees. But after the temperature returns to 25 degrees, the center point of the output voltage does not return to the original value at 25 degrees. And it needs to be completely powered off and then reconnected to restore the value corresponding to 25 degrees. Customer would like to know how to resolve this issue?

Thanks,

Annie

  • 0
    TI__Genius 15290 points

    Annie,

    This could be related to a few factors.  How is temperature being measured?  Are you only monitoring ambient?  How much soak time do you allow before rechecking the center point? What is the offset you observe? 

    As a magnet heats, the B field strength will weaken.  DRV5056 has built in temperature compensation to account for this.  If DRV5056 internal temperature is still not settled back to the initial start point, or the magnet is still heated, then we may see an offset until these settle out.

    Also, DRV5056 sensitivity scales with  Vcc. Any drift in Vcc will cause the center point to move.  It is also possible that if Vcc drifts with temperature and has not settled back to its original value that you would observe a center point shift as well.  Could it be possible that the Vcc value requires longer soak time as well?

    Thanks,

    Scott Bryson

  • 0 in reply to Scott Bryson
    TI__Genius 15290 points

    Annie,

    Was the information I provided above helpful?  Were you able to resolve the temperature drift concern?

    Let me know if you have any further questions.

    Thanks,

    Scott