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About Transient suppression in TIPD126 CerTIfied Design

Jayant Deshpande
Expert 1495 points
Other Parts Discussed in Thread: TIPD126

Ref. http://www.ti.com/tool/tipd126

Hi,

In the schematic shown in Figure A-1, why is D3 a bipolar device ? With D2 in circuit, a unipolar SMBJ40C should do the job!

Any specific reason I don't know about?

Thanks,

Jayant

 

  • 0
    TI__Mastermind 27715 points

    Hello Jayant,

    D2 is only intended to protect against reverse wiring of the loop supply. It isn't able to respond quickly enough or dissipate enough power to protect against ESD, EFT, and surge which could come from either direction. D3, however, is up to the task!

    Best regards,

    Ian Williams
    Linear Applications Engineer
    Precision Analog - Op Amps 

  • 0 in reply to Ian Williams
    TI__Prodigy 60 points

    Good Morning,

    Does anyone know where I can get one of these TIPD126 boards?  If not, do you

    know anyone I can contract to build this circuit on a breadboard or prototype pcb?

    Thanks in advance.

    Jody

  • 0 in reply to Jody Cruzan
    TI__Mastermind 27715 points

    Hi Jody,

    Like all of our TI Precision Designs, the board for TIPD126 is not an EVM and not intended to be orderable. It is simply a design-by-example.

    That being said, if there's an opportunity to win sockets with a customer and this board will help achieve that, I can provide you with one. Unfortunately I don't have any left so there would be a delay while the boards are fabbed and assembled.

    Best regards,

    Ian Williams

  • 0 in reply to Ian Williams
    TI__Prodigy 60 points

    Hi Ian,

    No worries.  This is just a project I'm working on for Rfab.  Trying to read some temp sensors without

    the cost and complexity of modern day transmitters.  We are trying to reading them directly to the PLC

    on a 2 wire, 4-20mA input.   I went ahead and ordered a couple of boards from a prototyping company

    and will try to build it myself.  Not the end of the world if it doesn't work out.  This is the last thing we are

    going to try like this.  The DAC191S997EVM won't do what I thought it would, so that's been kind of a

    dissappointment and a good example of how little I know and understand these development boards,

    It's been great fun messing with them though!  Thanks for all the help.  Will let you know how it goes.

    Thanks

    Jody

  • 0 in reply to Ian Williams
    TI__Prodigy 60 points

    Good Morning Ian,

    Still working on the temperature project.  Was wondering if any of the TIPD126 Boards have become available?

    If not, can you tell me where we are buying them?   I found a board from Analog Devices that is doing a great job,

    but managers want to try and use TI stuff if possible.   It's OK if we can't get these. I more than understand.

    Thanks for your time and have a safe and happy  Holiday Season.

    Jody