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SN65LBC184 supported IEC61000-4-5

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: SN65LBC184

Hi,

Our customer is looking for RS-485 device supported IEC61000-4-5.

Their surge voltage is peak-350V,1.2/50us in the condition.

I suppose that SN65LBC184 is supported IEC61000-4-5.

It is because the data sheet is described below.

Circuit Damage Protection of 400-W Peak
(Typical) Per IEC 61000-4-5

Is there a better solution than this ?

Best Regards,

Kato

 

  • 0
    TI__Mastermind 21769 points

    Hello Kato-san,

    The SN65LBC184 is currently the best device we have in our portfolio for IEC Surge performance.

    Thanks,

    John

  • 0 in reply to John Griffith
    Mastermind 7075 points

    John-san,

    Thank you very much for your prompt reply.

    The data sheet is described Circuit Damage Protection of 400W Peak.

    On the other hand,the example of evaluation is 538W(page13).

    Would you kindly tell me what is the max value guaranteed of surge-peak(IEC61000-4-5)?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 21769 points

    Hi Kato-san,

    The 400W is the typical value we are guaranteeing for the device. This value will vary over process, voltage and temperature. It will also vary by the layout of the PCB. The example on page 13 of the datasheet is an actual test that was performed on the device.

    Thanks,

    John

  • 0 in reply to John Griffith
    Mastermind 7075 points

    John-san,

    There is one more questions that I would like to ask you.

    If we guarantee more than 400W,Should TVS diodes be placed as below?

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 21769 points

    Hi Kato-san,

    If you are worried that in your application there may be transients (surge or EFT) that could be greater than 400W, then yes I would definitely recommend placing some external protection as close to the connector as possible.

    The SM712, is a very popular TVS protection diode that I would recommend. It has built in asymmetrical standoff voltages (-7 to +12 volts) like the  RS485 standard. In terms of layout I would place the device as close to the connector leaving the module as possible with the I/O 1 and 2 pins pointing towards the connector. This makes it so the transient energy is not forced to divert from the signal path to reach the protection device. Lastly we recommend placing multiple vias in parallel to a GND plane to lower the inductance of the return path. 

    Could you send me a link to the application note where you got those figures?

    Thanks,

    John

  • 0 in reply to John Griffith
    Mastermind 7075 points

    John-san,

    Thank you very much for your reply.

    If there is transients that would be greater than 400W in our customer's application,

    I would recommend them placing some external protection as your comment.

    The figure that attached previous E2E is the source of SLLA292A-Application Report.

    http://www.tij.co.jp/jp/lit/an/slla292a/slla292a.pdf

    Best Regards,

    Kato

  • 0 in reply to Toshiyuki
    TI__Mastermind 21769 points

    Hi Kato-san,

    Thanks for getting back to me. I had not read that application note yet.

    Have a good weekend!

    John