ESD Cap Sizing
ESD Cap Sizing
(OP)
I am trying to design a circuit with a 8KV contact rating (human body model). I want to use ceramic caps to provide esd protection. I want to see how I should size my caps. Is there a specific forumula/rule of thumb to use to determine the voltage rating and capacitance rating for my caps.
Thanks in Advance
Pert
Thanks in Advance
Pert





RE: ESD Cap Sizing
however, it's not just caps, or only caps. You need devices that divert the discharge current safely to ground. A typical scenario starts with modeling the human component as a 100 pf capacitor discharging 25 kV through a 1500 ohm resistor. The combination of capacitors, resistors, zeners, diodes, triacs, etc., that form the protection circuitry try to keep the protected device below whatever voltage specification it can meet. see: http://www.ecse.rpi.edu/~schubert/Course-Teaching-... A standard IC ESD protection uses the pad capacitance in conjunction with diodes, triacs,
http://www-tcad.stanford.edu/tcad/pubs/theses/sbee...
http://www.nxp.com/documents/application_note/AN10...
http://www.ti.com/lit/ml/sszb130b/sszb130b.pdf
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RE: ESD Cap Sizing
charge of the ESD gun =(8KV * 100pf) has to be less than the capacitance * voltage rating of cap
RE: ESD Cap Sizing
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RE: ESD Cap Sizing
Z
RE: ESD Cap Sizing
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RE: ESD Cap Sizing
Keith Cress
kcress - http://www.flaminsystems.com
RE: ESD Cap Sizing
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