I have a need for complete USB isolation up to 5kV surges. USB power will be provided by a separate (already isolated) good quality power supply.
There are plenty of products for sale but I build my own. Has anyone succeeded with this task and willing to share ideas?
Thanks,
WW
Not sure if this is of any use to you WW
http://www.analog.com/static/imported-files/data_sheets/ADuM4160.pdf
http://search.digikey.com/scripts/DkSearch/dksus.dll?pname?site=uk;lang=en;name=ADUM4160BRWZ-ND
Thanks.
I'm using that device now since early last year. I'm on my fourth chip :'(
It certainly eliminates ground loops but tends to fail after several high voltage hits below the published ratings.
Do you have USB isolation for your test equipment?
Hi WW
I have never used USB isolation GULP i have been OK so far, but i guess most of what i have done is low voltage, low power.
I guess you could say that chip must be doing it's job, if the equipment down stream is OK afterwards.
Quote from: Peterae on 2011.09.01, 10:51:12
I guess you could say that chip must be doing it's job, if the equipment down stream is OK afterwards.
That's the problem :-[
It took out an old laptop and two USB hubs. I have TVS's between lines and between lines and ground at key points. I was just after preventing ground loops as these can really screw up results.
Maybe I'll use WiFi isolation ;)
It appears WiFi will work. ZigBee on a PIC with a USB host port is fine for lower data rates.(I'm collecting data on a circuit wrought with transients using the ADCs in the PIC).
Nothing special about the CUTs. Just a load of problems with ground loops affecting the test outcome.