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TPS61232: PG doesn't set high

abe yusuke
Prodigy 50 points

Part Number: TPS61232

Hello,

I have a question about PG of TPS61232.

I make following,

/Vin=+5V

/Vout=+5V

I could see the Vout value is equal +5V. This is good result.

But PG isn't high level, it still keeps low.

Just tell me about this some reasons.

I attached that part of schematic too, so could you check it?

Best regards,

Yusuke

Main_PWR_distributor_sch.JPG

  • 0
    TI__Mastermind 20400 points

    Hi, 

    Can you connect PG pin refer to our EVM? Pls try if it is ok in below schematic. Thanks.

    Aurora

  • 0 in reply to Aurora Tie
    TI__Mastermind 20400 points

    In addition, the highlight part should be connected to GND. Thanks.

  • 0
    Prodigy 50 points

    Hi Aurora san,

    Thanks for your quick reply.

    I think both two your EVM schematic and my ones are same thing.

    The only difference is that your EVM is connected  VOUT, my sch is connected +3.3V called +3.3VO.

     +3.3VO already rose up and your data sheet shows that PG is open drain out put.

    Therefore, I saw it's no problem. 

    Then LD16 is through hole to check its level, so personalIy I shouldn't be connected to GND. 
    If that connect to GND, I only see low level.

    Could you tell me another different part in my sch?

    Best regards,

    Yusuke

  • 0 in reply to abe yusuke
    TI__Mastermind 20400 points

    Hi Yusuke-san,

    Sorry for before wrong suggestions. Yes, I think your schematic looks good. However, it seems that the TPS61232 cannot use the PG function. Because in the datasheet diagram, the PG side compares the FB voltage and the REF voltage. However, since you selected the fixed 5V output version, FB will be directly connected to Vout, and the internal voltage divider resistor will be used to generate a 5V output. This will let that the FB voltage remains higher than the REF voltage. Therefore, I think this function may not be working properly. Of course, I also think the voltage you're seeing now is strange.

    Since it's almost the weekend, I need to check with our DE team next Monday to confirm the internal circuit, and then I'll get back to you.

    Thanks for your patience.

    Aurora

  • 0 in reply to Aurora Tie
    Prodigy 50 points

    Hi Aurora-san,

    Thanks for your answer again.

    Ok, I will wait your DE team's answer next week.

    Best regards,

    Yusuke

  • 0 in reply to abe yusuke
    TI__Prodigy 180 points

    Hi Yusuke-san,

    Aurora will give you feedback later today.

    thank you!

  • 0 in reply to Carlo Sun
    Prodigy 50 points

    Hi Carlo-san,

    Thanks for your reply.

    Actually, I found that reason.

    That's why pin which is connected PG has pull-down resistor.

    So pull-up resistor 1Mohm that connecting PG changed less than 1Mohm.

    Then I could solved this problem.

    Thanks for your cooperation and say hello to Aurora-san.

    Best regards,

    Yusuke

  • +1 in reply to abe yusuke
    TI__Mastermind 20400 points

    Hi Yusuke-san,

    Glad to hear this. I also check with DE team this device’s function is ok. I will close this thread, if you have any other questions later，you can reopen it again. Thanks.

    Aurora