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UCC27511: OUTH pin abs max rating.

Martin Chien
Expert 3590 points
Part Number: UCC27511
Other Parts Discussed in Thread: UCC27512

Hello team,

I noticed the UCC27511 datasheet abs max rating table, the OUTH has only indicate DC is -0.3V but no pulse spec, and OUTL has -2V for pulse spec, can you tell why?

When if negative pulse -1.5V happens at OUTL pin, then should be at OUTH present the almost same pulse because R1 and R2 are low impedance.

So, only OUTL can support -2V has no help, OUTH should be support -2V as well.

Right now my customer happens UCC27511 FA issue, I would need to check pin waveform, please comment about my question, I need your help to explain the abs max rating about this.

Thanks a lot.

Martin

  • 0
    TI__Mastermind 23215 points

    Hello Martin,

    You have a valid question about the OUTH and OUTL rating difference. I am confirming with IC design if the ratings should indeed be the same. I will follow up when I get feedback from IC design.

    Richard

  • 0
    TI__Mastermind 23215 points

    Hello Martin,

    I confirmed what testing has been done on the UCC27511 and UCC27512 family for the output negative transient.

    For the output negative voltage clamping the low side MOSFET channel and body diode will be clamping the negative voltage and will conduct current.

    In the case of the UCC27511 it is the OUTL pin connected to the low side MOSFET so this pin was tested for the negative voltage transient specified.

    In the UCC27512 the high side and low side driver FET are connected to the single OUT pin. This single pin was tested for the negative short term transient of -2V.

    On the UCC27511 if the OUTL and OUTH are connected together, the OUTH can effectively handle the -2V negative transient shown on OUTL pin.

    Richard

  • 0 in reply to Richard Herring
    TI__Expert 3590 points
    Hi Richard,
    Since the OUTH can handle -2V negative transient, why datasheet doesn't show it? Would your team update the datasheet?