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UCC28951: Absolute maximum rating

Charles Zhang1
Expert 3410 points
Part Number: UCC28951

Tool/software:

Hi Team,

I have a question on the allowable negative voltage rating of UCC28951, I guess "-0.4V" here refers to the continuous voltage rating applied on the IC pin.

How about the transient voltage rating with short duration? Should we still regard -0.4V as the abs maximum rating?

In my customer's application, pin voltage would ring below -0.4V, not sure if it is a risk on reliability.     

Regards,

Charles

  • 0
    TI__Guru* 85826 points

    Hello,

    Your inquiry is under review and I will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85826 points

    Hello,

    The absolute maximum should not be exceeded.   This is not a continues rating but also a transient max rating.

    The limits cannot be exceeded for a brief time because it could lead to latent failures.

    Regards, 

  • 0 in reply to Mike O'
    TI__Expert 3410 points

    Hi Mike,

    Understood.

    Do you have recommended test setup for measuring IC pin voltage stress?

    Like oscilloscope bandwidth, oscilloscope sampling mode, etc.

    Regards,

    Charles 

  • 0 in reply to Charles Zhang1
    TI__Guru* 85826 points

    Hello,

    Your inquiry is under review and I will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 85826 points

    Hello,

    It is generally recommended not to use bandwidth limiting on the scope, because this could filter out real over voltage spikes.   One technique is to use tip and barrel with a scope probe and wrapping the scope probe wire around a toroid.  Please see the below diagram for a tip and barrel measuring technique.

    When evaluating the pins of the controller you need to put the tip and barrel connections on the IC pin ground and the pin under evaluation.

    You need to make the leads for the tip an barrel connections; as short as, possible.  These leads can act as antennas and short traces will reduce stray noise pickup.   Be careful not put the scope probe across EMI generators like heat sinks, FETs and transformers. 

    Regards,

    Regards,