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UCC27324: Higher threshold

Kuan Wei Chen (Kevin Chen)
Genius 9710 points
Part Number: UCC27324
Other Parts Discussed in Thread: UCC27524,

Dear Team,

The customer is facing the driver will output the wrong signal during the surge test.

So do we have higher threshold voltage or we have circuit can prevent interference during surge?

Customer will prefer P2P, with 4A driving capability.

If no P2P is also welcome.

BR

Kevin

  • 0
    TI__Genius 13445 points

    Hello Kevin,

    A solution to try is adding a filter on the inputs such that Rin <= 100-Ohms and Cin <= 300pF to prevent the false triggers. 

    Please let us know if this does not address the issue.

    Regards,

    -Mamadou

  • 0 in reply to Mamadou Diallo
    TI__Genius 9710 points

    Dear Mamadou,

    Thanks for the input.

    The customer already implement the filter in their circuit with lower Fc frequency.

    Do you have further ideas on how to enhance noise immunity to prevent the transient effect caused by the surge?

    Or you have a layout guide customer can follow to prevent?

    BR

    Kevin

     

  • 0 in reply to Kuan Wei Chen (Kevin Chen)
    TI__Genius 13445 points

    Hi Kevin,

    In that case, UCC27524 might be a better option: different input structure (hysteresis and active pull-down on the input stages) while UCC27324 consist of a MOS-gated input stage and does not offer hysteresis on inputs therefore is susceptible to false turn-on when the driver is subject to noise or surges.

    The devices are p2p and UCC27524 has higher drive current 5A and wider VDD range 20V abs max.

    Please let us know if the issues persist with UCC27524.

    Regards,

    -Mamadou