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TPS23756: 如何實現power good function

eason
Prodigy 20 points
Part Number: TPS23756
Other Parts Discussed in Thread: TPS2378

想要實現一個function ,當TPS23756 output  ready ,turn on  MOS(PQ5) 連接兩個P_GND,所以不知TPS23756 哪個PIN 可做到?  PPD PIN or ?

  • 0
    TI__Genius 13385 points

    您好，感谢您对TI产品的关注！为更加有效地解决您的问题，我需要多一些时间查看这款芯片，稍后会为您解答。

  • 0 in reply to Lydia
    TI__Genius 13385 points

    您好，感谢您对TI产品的关注！由于问题比较复杂，我需要询问更了解这款芯片的TI资深工程师，再为您解答，一旦得到回复会立即回复给您。

  • 0 in reply to Lydia
    Prodigy 20 points

    Please tell me when you will get the answer,感謝~

  • 0 in reply to eason
    TI__Genius 13385 points

    Hi,

    I need to ask a senior TI engineer who knows more about this chip, and then answer for you, and I will reply to you as soon as I get a reply.

  • 0 in reply to Lydia
    TI__Genius 13385 points

    Hi Eason，

    May I know where are the two P_GND grounds? TPS23756 does not have a dedicated power good pin, but if PoE is your only power source, you may consider to use DC/DC's output as indicator. 

    Best regards,

    Lydia

  • 0 in reply to Lydia
    Prodigy 20 points

    Hi, this propose for the PD+PSE design,plan to the PD gnd as PGND , PSE gnd as PD_GND1. When the PD power ready ( to control PQ5 ,let PGND to connected to PD_GND1).  Avoid seeing PD+PSE at the same time.

    Thanks!

  • 0 in reply to eason
    TI__Genius 13385 points

    Hi ,

    Thanks for your information.

    Do you have a PoE passthrough structure? Like below but can have different devices.    

    If so, we normally not disconnect PSE's and PD's ground, but set a delay for the PSE. If PSE has enable or reset pin, you can set a RC delay to make the PSE slower turn on to avoid causing trouble with PD's start up. Also TI's PDs without PWM controller (like TPS2378, TPS2372-3, TPS2372-4) have PG pins can be considered too.

    Best regards,