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UC3823A current limit problem

Prodigy 20 points

Replies: 1

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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.

1 Reply

  • Pete,

    Take a look on the SS pin and see if it is oscillate with a small ramp at the same frequency.

    Send me a copy of the schematic and traces of the SS pin, Ilim pin, EAOUT pin and OUTA or OUTB.

    John Bottrill

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