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  • TI Thinks Resolved

TLV62568: TLV62568 Question.

Genius 13220 points

Replies: 4

Views: 86

Part Number: TLV62568

Dear Sir,

Please kindly see below red circle.

When external power is unplugged, the supercap would provide power to system(VBUS). At this time, the buck enable pin is kept high, but the Q403 would conduct and short to GND. What situation would the buck be in this case? Should the buck be disabled at this case?

Thanks, Ian.

  • In reply to Ian Wang:

    Dear Sir,
    If someone can help it?
    Thanks, Ian.
  • In reply to Ian Wang:

    Hi Ian,

    Thanks for contacting us. We're looking at your system and will feedback to you later today.

    Best regards,
    Yann

    ___________________________________________________________

    Find answers to common questions in the LPDC App Note Index

  • In reply to YD:

    Hello Ian,
    I am glad to support you. When the enable pin is high, and the Q403 is on, the resistance of the feedback divider will be decreased causing an increased voltage output. Theoretically, lowering the feedback divider close to 0 Ohm, you will obtain at the output Vin. If you want to get this scenario with Vout close to Vin you should leave the Enable pin high; otherwise you must disable it.

    Thanks and best regards,

    Alfonso

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

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