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TPS3890: Behavior during CT charging

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Replies: 3

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Part Number: TPS3890

Hi,

If sense voltage reaches VITP before CT voltage hits VCT as following picture, How does CT pins and /RESET pins works?

Best Regards,

Kuramochi

  • Kuramochi-san,

    The CT capacitor is charged by an internal current source as set by the user.This capacitor starts charging as soon as the RESET conditions are cleared. When the voltage on this capacitor reaches 1.22V, RESET is deasserted. If the device hits VITP before VCT is reached, the glitch immunity of the device should catch this condition, please see below:

    Thanks,
    Abhinav.


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  • In reply to Abhinav.Sharma:

    Abhinav-san,

    Thank you for your help.

    If sense voltage reaches VITP before CT voltage hits VCT, /RESET is not asserted and CT voltage is kept.

    And next delay time is shorter than setting time as following picture.

    Are they correct?

    Best Regards,

    Kuramochi

  • In reply to Kuramochi Tadahiko:

    Kuramochi,

    I believe your understanding is correct.

    Thanks,
    Abhinav.


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