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TIOL112: CQ discharge current

Atsushi Hirai
Expert 4910 points
Part Number: TIOL112

Hi team,

My customer is checking TIOL112's behavior.

In push-pull mode, when they change the state of EN and TX from EN=H, TX=L(=>CQ=L+) to EN=L, TX=L(=>CQ=Hi-Z), the CQ output voltage has a step at 3~4V, then fully discharged around 40ms later.

Since the CQ discharge current spec on the datasheet has a condition of "V(CQ)>=5V", I think this is the reason. Could you explain what is happeneing? What is this 40ms?

Regards,

  • +1
    TI__Mastermind 33030 points

    Hi Hirai-san,

    There is an internal Inductor Demagnetization clamp that turns on for 40ms when the EN pin transitions from High to Low.  If there is an inductive load connected to the CQ pin that has been energized, there will be a large kickback transient voltage spike when the CQ pin becomes Hi-Z and this internal clamp will help demagnetize the inductor and quickly and safely without triggering the ESD cells.

    Regards,

    Jonathan