ISO7241C: basic electrical insulation?
Part Number: ISO7241C
My product need pass the IEC61000-4-2 ESD certification, the testing voltage level high to +-15kv for air/contact discharge, I found the isolator was always damaged by ESD strike during testing, in my design, I put two 50meg ohm resistors in series between two isolated ground( one is the isolated ground that connected to a connector that is ESD testing points, one is the digital ground that connected to mental chassis through screws), to protect isolator and also to make sure the product can pass the ESD testing, any additional components like TVS or gas discharge tube or some circuits else needed?
1, if add a external TVS, how to put this TVS, put it between connector pins and digital ground, or put it between connector pins and isolated ground?
2,the same question for gas discharge tube?
3, Can I add a gas discharge tube or an Y capacitor between the isolated ground and digital ground and parallel with two series resistors? if add a Y capacitor, what value is best?
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In reply to Dan Kisling:
Thanks for your quick response and thanks for your suggestion.
duo to other reasons like schedule/cost so far we don't want to change to other isolator, we prefer to improve ESD performance by other way like adding some external components at the signal path.
I am looking forward the suggestion from your IEC61000-4-2 expert.
In reply to lesheng cao:
I've checked in with our experts and I have a few recommendations for you:
Please let me know if you have any additional questions.
In reply to Manuel Chavez:
Thanks for your reply.
I will follow your suggestion and then to try if it can pass ESD testing, I may update the testing results later.
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