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UC3823A current limit problem

When increasing power FET current to test the ILIM function I find that the output goes low as it should when ILIM is exceeded, but a single 5 usec pulse appears at the output about 800 usec after the ILIM comparator trips. Soft start C = 10uF, Rt = 42.2K, Ct = 4700pF, LEB C = 200pF, free running freq = 9.7kHz, sync freq = 19.5kHz. I would like to know how to get rid of that lone pulse after shutdown.