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UCC3895 Minimum Temperature specification

Russell Newman1
Prodigy 20 points
Other Parts Discussed in Thread: UCC3895, UCC2895

The UCC3895 has a minimum operating temperature of 0C.  We've had multiple failures of the IC when the temperature is 5C or less.  No problems at >5C.  My question is why the operating spec of 0C?  Should I anticipate failures running at 0C.  What is the difference in technology between the UCC3895 and the UCC2895?

A little backgroung. 

We only have the problem if the PWM is disabled for a period of time allowing the internal ambient temperature to cool of the power supply to cool to the temperature of the cooling system. 

  • 0
    TI__Mastermind 25776 points

    the only difference is the working temperature range UCC2x wider than UCC3x...

    but from silicon point of view there is not real difference (it is not a different design, I mean...)

    when this (pretty common I would say) issue occurs, not related to UCC, the root cause is the behaviour of other components in the circuit (L, C, D, FETs, etc...)

    V.

  • 0 in reply to Vincenzo Pizzolante
    Prodigy 20 points

    We continue to experiance PWM failures.  We have identified the source of the failure, but not the mechanism.  We're driving a full bridge at ~25Khz.  When one of the upper legs shuts down for, DE_Sat or under voltage the PWM will fail.  We've been unable to capture any anomalies on VCC, PGND, AGND or the output pins.  Is there an FA service at TI that could evaluate a dead PWM to tell us where the damage is?  

  • 0 in reply to Russell Newman1
    TI__Mastermind 25776 points

    could you send me the schemaitc?

    do all the boards fail, I mean, is it systematic or randomic?

    which parts are damaged? is it the controller only?

    Vincenzo