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  • Resolved

TPS65150: start up sequence of GD output

Guru 20090 points

Part Number: TPS65150

Hello,

In the customer the GD output was not latched low when boost converter was stabled.
The GD output was latched low when VGL output is stabled.

In the customer sequence is the following.

Boost Converter in regulation ---> (about 3ms) ---> VGL output in regulation ---> (about 1ms) --->GD output latched low.

Does the GD output has delay?

I can send the schematics and waveform if you contact to the following e-mail address.

asaka-r@clv.macnica.co.jp


Best Regards,
Ryuji

  • Hello Ryuji,
    It seems that the datasheet is misleading in this point. Soon we will come back to you with the correct behavior.
    Best regards,
    Brigitte

    Best regards,
    Brigitte

     For more information on buck-boost devices have a look at .

  • Guru 20090 points

    In reply to Brigitte:

    Hi Brigitte san,

    Thank you. I'm looking forward to your reply.

    Best Regards,
    Ryuji
  • In reply to Ryuji:

    Hello Ryuji san,

    GD is latched low as soon as the boost converter output is regulated and the boost soft start is completed. This can take about 5 ms. The second part of this condition is missing on the detailed description. It will be included in the next revision of the datasheet.

    Best regards,

    Diaara

  • Guru 20090 points

    In reply to Diaara:

    Hello Diaara san,

    Thank you for the reply.
    Please see the attached measurement result.
    In the attached file, the GD output was latched low after 4ms from Boost output started.
    Is this correct operation? 


    Best Regards,
    Ryuji

  • In reply to Ryuji:

    Hello Ryuji san,

    Yes, this is correct operation.

    Best regards,

    Diaara

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