• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 33 subscribers
  • Views 759 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS2549-Q1: Not use TPS2549-Q1 current limit detect

Akihisa Tamazaki
Genius 12470 points
Part Number: TPS2549-Q1

Hello Team,

The customer do not like UVLO fuction of TPS2549-Q1, so they are considering the following figure..
 1) Is it possible to use TPS2549-Q1 as the folowing diagram?
 2) Is the load register and load capasitor required at OUT(12pin) if the answer of question 1)  is yes?
 3) What value of  load capasitor is required? The customer would like to use smaller capasitor than 22uF.

Would you please advise ?

Your help would be so appreciated.

Best Regards,
Akihisa Tamazaki


  • 0
    TI__Mastermind 42795 points

    Can the DC/DC provide the current limit function for the USB port? If so, then this can work if the charging mode remains CDP or SDP. You could try this by using the EVM to see if it would work.

  • 0 in reply to Eric Wright
    TI__Genius 12470 points

    Hello Eric-san,

    Thank you for the answer.
    The customer uses TPS2549-Q1 in CDP mode, and DC-DC has the current limit function for USB port. As far as the customer and I tried, TPS2549-Q1 had no problem. However the customer and I wanted to confirm to the BU whether we can use TPS2549-Q1 without current limit function as we think about specification of TPS2549-Q1.

    How about OUTPUT pin configuration? Should we add the load resisters or capasitors? Would you please recomended circuit for OUT pin

    Your answer would be so appreciated.

    Best Regards,
    Akihsia Tamazaki

  • 0 in reply to Akihisa Tamazaki
    TI__Mastermind 42795 points

    Hello Tamazaki-san,

    I would suggest using the Rilim resistor within the recommended range and then OUT can simply be left open (no output C or R). Since the device will operate in the enabled state, OUT will be connected to IN so that Cin is connected to OUT. If there is a worry that OUT could be damaged if the device is disabled, then a small bypass capacitor (0.1uF) could be placed at the OUT pin.

  • 0 in reply to Eric Wright
    TI__Genius 12470 points

    Eric-san,

    Thank you for your answer.
    The customer said thank you for your prompt answer.

    Best Regards,
    Akihsia Tamazaki