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ISO6741: ISOW7841 & ISO6741FQDWRQ1

Ata Niknejad
Prodigy 10 points
Part Number: ISO6741
Other Parts Discussed in Thread: ISOW7841, , ISOW7741

Hallo together, 

we implemented in 2 of our product platforms, 2 different isolators from TI.  

In both designs, we have a lot of EMC issues. Which looks the source should be Isolator. 

To verify the right sources of this issues, we need the EMC test reports for following parts:

- ISO6741FQDWRQ1

- ISOW7841

Additional to test reports, we are looking for documentations / applications notes likes routing, Placements,  .. to optimizing the EMC behaviors.

As you know EMC test report, is a part of PPAP.

I hope, I can finally get faster the right answers in my case. ;-)

Best regard

Ata  

Modules Expert EMC

HW

 

Webasto Group

 

Phone: +49 911 376 576-65

E-Mail: Ataollah.niknejad@webasto.com 

Webasto SE

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www.webasto-group.com

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  • 0
    TI__Guru 53095 points

    Hi Ata,

    Welcome to TI E2E forum!

    Sorry about the issues you are facing and thanks for reaching out to us.

    ISO6741 is a digital isolator which doesn't have any power switching components in the device as it is only a data isolators, hence, we do not expect it to be the cause for any radiated emissions issues. Please find below CISPR 32 radiated emissions test result for the device. As you can see, there are no radiating components in the plot contributed by the ISO6741.

    While the ISOW7841 is a digital isolator with an integrated DC/DC converter. Since this has power switching components inside, it can be the source radiations. Although the device in itself the emissions to minimal, the actual results on a an end-equipment can be higher as the radiated emissions results largely depend on the PCB size & design, number of cables connected & their length and the overall test setup. Please see below a link to an application that talks about ISOW7841, describes its emissions results and also lists out various solutions that can implemented to minimize radiations.

    Low-Emission Designs With ISOW7841 Integrated Signal and Power Isolator (Rev. C)

    To understand if the emissions in your applications are caused by ISOW7841, please do share the emissions results so that I can review and confirm and also make any suggestions to improve them. It would also be helpful if you could share the schematic, PCB layout and emissions test setup details which help fix the issue faster.

    Please do also note that ISOW7841 is our first-generation digital isolator with integrated DC/DC converter. We now have ISOW7741 which is a second-generation device with significantly improved radiated emissions performance along with many other benefits. If it is still an option, we recommend that you use the ISOW7741 so that the radiated emissions remain minimal.

    I will look forward to the data from you, thanks.


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    TI__Guru 53095 points

    Hi Ata,

    Checking in to see if you are still facing the radiated emissions issue. If you do, please share the requested information so that I can confirm if what you are seeing is expected from the devices and also provide my inputs to improve the results. Thanks.


    Regards,
    Koteshwar Rao