Functional Safety for Integrated Circuits Used in Variable Speed Drives
نویسنده
چکیده
Requirement 1—To use reliable components. This means ICs with a sufficiently low FIT rate. FIT rates are often calculated according to standards such as IEC 62380 or SN 29500, which base their results on the average failure rate seen in the field for various types of components. Alternatively, data can be based on accelerated life testing such as that found at analog.com/ReliabilityData. One important consideration is that the PFH (probability of dangerous failures per hour) figures given in IEC 61508 and similar standards are for an entire safety function and not just for a single IC. Therefore, the PFH figure of 10 h for a SIL 3 safety function (100 FIT) might give an error budget of only 1 FIT for a given IC. It is also worth noting that the term PFH actually means the probability of dangerous failures per hour. It can be argued that at least 50% of failures are safe and that the reliability limit for the IC can be doubled.
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