Working on an compact electronic ballast design (~5 W load), I see the need for an over-voltage protection circuit that has a 'slow-blow' characteristic. When a lamp is turned on, a striking voltage above steady-state is required for ignition, say for a few milliseconds. But when the lamp is at end-of-life or not connected, the open-circuit voltage persists indefinitely.
ON Semi's AN1543 provides some examples on page 15, the one below being the simplest.
Question: is there a single device, or simpler implementation, for this application? An answer has already been given recommending varistors/MOVs, but all that I find online seem to be instantaneous. I assume that if there were a single device then it would be more common, but I'd like to ask anyway.
I thought that perhaps a slow-blow fuse plus resistor combination in parallel with the lamp might do the trick. But deviating from protection devices' intentional use gives me hesitation.