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Original question:

ISOW7841: High EMC emissions at 64, 207 & 316MHz

ISOW7841: EMi noise due to overloading

Daniel Serrato1
Prodigy 20 points
Part Number: ISOW7841
Other Parts Discussed in Thread: SN6505B

Hello TI team 

Continuing with the topic related to the question: e2e.ti.com/.../954520

We realized that we were consuming more current than what the isolator can supply (around 250mA) thus overloading the component.  Since implementing 3 ISOW7841 won't be the best solution, we were wondering if there any other IC solution that can provide the same isolation characteristics required by the standard EN-60601 but capable to supply the power required by our system.

Thanks for your attention

  • 0
    TI__Mastermind 49445 points

    Hi Daniel,

    Thanks for reaching out and for sharing that you were using device ISOW7841 with about 250mA of load. Like you have mentioned, ISOW doesn't support 250mA of current and instead it only supports 130mA when then VCC is 5V and supports 75mA when VCC is 3.3V. I see you are using ISOW7841 with 3.3V input and 3.3V output voltage configuration, it can only support of about 75mA in this configuration.

    Unfortunately, 250mA is too high a current for the device to operate at and be able to support it thermally in the same package. Hence, we do not have any device in that footprint which can support 250mA. We do have devices with external transformers that can support output current upto 1A. Please do take a look at SN6505B datasheet and EVM, the datasheet also lists various transformers that can be readily used with SN6505B to get various output voltage and current configurations.

    Since SN6505B operates at much lower switching frequency, you shouldn't see any radiated emissions issue either. Let me know if this device suits your requirement and if you have any further questions, thanks.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Prodigy 20 points

    Hi Koteshwar 

    The SN6505B solution seems to be suitable for our application. We are going to get some samples and test them on the next days.

    Thanks for your support.

    Daniel Serrato.