A CCS has two voltage limits.
At the lower voltage it cannot regulate current anymore and behaves almost like a short. Once the voltage goes up it recovers and behaves normally. Depending on the design of the CCS and the duration of the "under voltage", it may recover instantly or it may take a little while to return to normal operation.
At the upper voltage limit, the CCS breaks down and if you are lucky it behaves like a zener (a regulator tube); however, usually at the upper voltage limit the CCS's internal parts fail and the CCS becomes a permanent short.
Silicon does not have a sense of humor about over voltage. It only takes an instant of over voltage to damage, degrade or destroy silicon. Tubes are more forgiving about this. When a tube says 300V plate voltage, it means you can bias it at 300V. With silicon says 300V rated voltage, if you go above 300V, the silicon is likely to be damaged, degraded or destroyed.
In between the two voltage limits, the CCS forces the current to be what ever the CCS's set point is, no matter what the voltage drop is across it. The better the CCS does this, the better the CCS is.
AA의 tubeDIY에서 CCS short 검색하시몬 원문 볼수 있심다.
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