Gents,
Does anyone remember a manufacturer that makes through-hole USB-B jacks with common mode chokes in there? Preferably with a metal flap that can also be grounded against a front panel.
Came upon a situation where they didn't place CM chokes on the board, trying to see if it can be remedied sans relayout.
I had just been using a ferrite bead and passing the USB D- and D+ lines both through it.
Looks very tight in our case but that's an idea. Maybe we can find a really flat bead.
"Joerg" a écrit dans le message de news: snipped-for-privacy@mid.individual.net...
Hi Joerg,
You can also use the same solution that the trick used in plenty of, well, east-designed products : ship it with a USB cable with a built-in ferrite bead on the device side. That way the "product" is the cable+device kit, and your EMC certification will pass without problem. Of course your customer may have issue if he use another USB cable, but that's no longer your problem ;+)
Friendly yours, Robert Lacoste www.alciom;com
A big ferrite over the whole cable isn't helping, just a tiny ferrite over only D+ and D- (together, or course) is what helps. Haven't found any cable that has those. If anyone knows a source I am all ears.
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