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Ancillary circuitry added to a design that provides protection of the main circuitry to enable the main circuits continuing functioning. In some cases the protection circuitry is sacrificial, being destroyed or degraded in the act of protecting. But not all protection circuits may do this. Examples of faults protected against are: Overvoltage, ESD, overheating, Overloading (too high of a current draw) amongst others.

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Time to trip of most of PTCs is about 0.1 seconds. In case of short between VCC and GND the current will be very high (maximum a power supply can provide) for at least 0.1s. Isn't it enough to burn ou …
asked Nov 12 '10 by ibiza