On a second thought, the "sw" only might do (it has "vt" and "vh"),
but if an additional delay is needed (to avoid "time step too small:
errors), the comparator will come in handy.
Vlad
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ltspicegoodies.ltwiki.org -- holding, among others:
a universal analog/digital filter, block-level models
for power electronics (and not only), math blocks
with a more stream-lined approach, some digital
ADC, DAC, (synchronous-)counter, JKflop, etc.
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I don't really understand your purpose but, given what you have said:
OK: Now can I rig a feedback which essentially lies dormant until the
error voltage exceeds maybe 50mV, then jumps in to force balance?
you could make use of a comparator (use the Schmitt A-device with "vt=50m
vh=0") and a VCVS (element "sw") with proper Ron/Roff. I'll just leave the
"how" and "why" for yourself.
