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The LM27402 is designed to detect the voltage across the DCR of an inductor through the use of a sensitive current limit comparator. Five current limit events within thirty-two switching cycles must occur to mitigate the effects of noise and transitory over current events before hiccup mode activates. This allows the current limit level to be set close to the peak inductor ripple during maximum output current where the voltage across the comparator may only be several millivolts.
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