[SI-LIST] : Unit failing ESD testing

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From: Jeff Reeve ([email protected])
Date: Thu Nov 02 2000 - 17:25:11 PST

SI List,

ESD related situation (maybe due to EMI resulting from ESD?). I have a
battery powered PCB surrounded by a plastic enclosure, on the rear of the
enclosure are several pins that are used to charge the battery when the
device is placed into a charger (similar to a cell phone). Contact points
are 12V and GND on the rear of the unit. I would like to operate up to 8kV
contact discharge to the unit (at the GND/12V contact) before the device
exhibits failures. Presently, the device functions up to 4kV and then begins
to exhibit failures (it resets itself and continues to operate). I have
tried a very fast Zener across 12V and it did slightly improve things but
not enough. There is a 1.5" ribbon cable from the battery PCB to the Digital
PCB. I clamped a ferrite across the cable and that also seemed to help (good
to 6kV) but that too was not enough. Maybe I have not given enough detail?
But I ask the question: What are common means to improve immunity to ESD
contact discharge? Perhaps someone is willing to share their experiences or
pointers to papers?

Many thanks in advance for your sharing...this is a awesome list!

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