I would start here:
http://www.centralsemi.com/PDFs/sele...t_is_a_cld.pdf
A Current Limiting Diode, also known as a “Currentlimits or regulates current over a wide voltage range.
Regulating Diode” or a “Constant Current Diode”, performs
quite a unique function. Similar to a zener diode,
which regulates voltage at a particular current, the CLD
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