Stuff happens, breakdowns, arcs, leakage, flashover, etc.
Plan on it. To avoid destroying a delicate cmos chip with a 500v
transient, I suggest surrounding the 500v section with a ground trace
(I assume it's not the only thing on the board). Then any leakage,
breakdowns, etc are relatively benign and the circuit will recover
when the conditions are corrected.
Some time ago I designed a PMT base with a s.m. resistor divider
chain. To reduce electric fields (about 1kv at the photocathode) on
the board, I used an 805 footprint with rounded ends (no square
corners). It was probably not really needed, but the bases have never
given any trouble.
Richard
[EMAIL PROTECTED], Cheesecote Mountain CAMAC, 24 Halley Drive; Pomona, NY 10970
voice: 845 364 0211, NEW fax: 877-840-0023, Skype: cmcamac, www.cmcamac.com
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11:17 PM
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