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ISO1042: Isolation breakdown when overheating

Part Number: ISO1042

Hi Forum.

We are currently evaluating the ISO1042 as basic insulation for a 1kV DC-System. We are working with the german TÜV for a safety standard approval of our system, however we have trouble with this tranceiver.

On page 8, Chapter 6.9 Safety Limiting Values, we can see that the isolation is only certified under the condition that the device does not get too hot. Therefore we neet to limit the maximum power dissipation. For the supply voltage we "could" use a series resistor, but we are unsure whether this would disrupt the supply too much. Also we are unsure how to address this problem on the datalines.

The Application report SLLA419 seems to be a good starting point for device protection regarding damage of functionality, but the overpower issues of these isolated tranceivers is not addressed.

Are there any other documents that could provide further information?

Kind Regards

Florian

  • Hi Florian,

    Welcome to TI E2E Forum and thank you for reaching out to us with your questions.

    Please go through the below article on safety limiting values that talks about safety limiting isolators in general. It doesn't specifically refer to ISOCAN device like ISO1042 but I believe the generalized approach can be applied to ISO1042 as well. Let us know if you have any questions, thank you.

    Regards,
    Koteshwar Rao