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TPS65132Lx - About startup time of VPOS

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Guru 21045 points
Other Parts Discussed in Thread: TPS65132

Hi Team,

 

We understand that the startup time of TPS65132Lx is 500us(typ).

However, our customer would like to know the min and max value.

Could you please let us know if you have any information?

 

Regards,

Kanemaru

  • 0
    TI__Guru 65450 points
    Hello Kanemaru-san,

    The minimum and maximum startup time is not specified in the datasheet. Is there a specific minimum and maximum value the customer is not allowed to under- or overshoot? What is the reason for the customer asking for this parameter?

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Guru 21045 points

    Hi Brigitte-san,

     

    Thank you for your reply.

    According to customer, they need more than 500us so the startup time must not become less than 500us.

    Because, this specification is demand of the LCD panel(Load device).

    Therefore, they would like to know the minimum value of the startup time.

     

    Could you please let us know this value?

    This value does not need to be a guarantee.

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    TI__Guru 65450 points
    Hello Kanemaru-san,

    Do you know if the panel vendor has a reference design with TPS65132 in it? If yes, this would make sure that our part can work with this panel. If not, we need to understand how low the startup time can go. At the moment I do not have a number for the minimum startup time, but will try to get this information. Would you please clarify which voltage on the panel needs the 500us startup time?

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    Guru 21045 points

    Hi Brigitte-san,

     

    I don't know whether this device is a reference design.

    Because, Our customer does not disclose information of the panel.

     

    I contacted Ilona-san at the different thread.

    https://e2e.ti.com/support/power_management/lcd_oled_bias/f/954/t/440096

     

    If you contact to below my e-mail address or let me know your e-mail address,

    I can send the customer information.

    I’m looking forward to hearing from you.

     

    [my e-mail address]

    Kanemaru-h@clv.macnica.co.jp

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi Brigitte-san,

     

    The following is the information that I have.

     

    [Customer’s specification]

    -VPOS & VNEG is +/- 5.4V(TBD).

    -Startup time of VPOS is more than 0.5ms(500us).

    -Startup time of VNEG is more than 1.0ms.

    -Output current = 15mA(normal load current) , more than 100mA (when startup).

    -Output discharge function is required.

     

    And, if you contact to my e-mail address or let me know your e-mail address,

    I can send the detail specification of the startup and stop sequence.

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    Guru 21045 points

    Hi Brigitte-san,

     

    Would you tell me about the progress on this matter?

    I’m looking forward to hearing from you.

     

    Regards,

    Kanemaru

  • 0 in reply to Hide
    TI__Expert 8010 points
    Hello Kanemaru,

    Ill take over from here :)
    I have some questions back to you. Why do you need the 500us? Is it to set a limit of the inrush-current or do you want to ramp up VOUT (or VIN?) at that speed?
    Thank you,
    Regards,
    Ilona