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ESD protection for Isopower devices?

Question asked by Earl on Jan 17, 2012
Latest reply on Jan 17, 2012 by MSCantrell

I need power and communication isolation for a medical device to meet 60601-1-2. Part of this is resistance to electrostatic discharge (ESD) events: 6kV contact and 8kV air discharge. Both these have 0.8ns rise times. Assuming this pulse hits one side of the isolation barrier, it seems to exceed the common mode dv/dt rating of the ADuM6400 series (100kV/us) as well as the 5kV isolation voltage.

 

Can the Isopower devices withstand ESD like this? How much does the isolation degrade?

 

If it cannot sustain repeated static strikes, how should I protect the isopower device?

 

The system must avoid leaking more than 100uA to the patient when biased to 250Vac(50Hz), and must also withstand a 4kVac isolation test.

 

The scenario is quite realistic: my instrument could be grounded on one side of the isolation barrier, and hit with static on the other (patient) side.

 

Thanks for any help,

 

Earl.

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