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Информация о материале
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Автор: Super User
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Родительская категория: Заметки
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Категория: Электроника / cхемотехника
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Просмотров: 266
The ratio of actual ripple current to rated ripple current (IA/IR)
more about capacitors in this good guide:
https://www.vishay.com/docs/28356/alucapsintrobcc.pdf
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IA stands for actual ripple current - the RMS current actually flowing through the capacitor due to applied voltage ripple/noise.
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IR stands for rated ripple current - the maximum RMS current rating specified by the manufacturer for the capacitor.
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The ratio IA/IR is an important parameter that should not exceed 1. Operating a capacitor where IA/IR > 1 risks overheating and reducing its lifespan.
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IA/IR provides an indication of how heavily stressed the capacitor is under the actual operating conditions compared to its rated specifications.
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A lower IA/IR ratio means longer expected lifetime as there is headroom under the rated ripple current limit.
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Power supply designers aim to keep IA/IR < 0.5-0.7 for electrolytic filter caps to ensure long lifespan.