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TPS61030: Problems with TPS61030

Julian Pisters
Prodigy 40 points
Part Number: TPS61030
Other Parts Discussed in Thread: BQ24090, , TPS2511, TPS61032

A view days ago, i was designing a small powerbank with integrated lipo charging ic. I want to charge mobile Phones, Headphones and so on. I used the BQ24090 and it works fine. For the step up switch I used the TPS61030 and for charging smartphones I used the TPS2511. After designing and soldering I was testing the circuit but I can't find the Problem. If I put my mobile Phone on it, it starts charing for one second and stops after this one second. When I measure the voltage, I measure 4.98V without any load. With Load there are 4.68V, but it doesn't work anyway. The charging of the battery works fine. I put the schematic to this post. I hope you can help me. 

Thank you

best regards

Julian

Schematic_Not Powerbank Fahrrad_2020-07-27_13-17-05.pdf

  • 0
    TI__Guru 58815 points

    Hello Julian,

    Please check if the charging of your mobile phone works properly when connecting 5V to the input of TPS2511 instead of TPS61030.

  • 0 in reply to Brigitte
    Prodigy 40 points

    Hello Brigitte,

    today I tried connecting the TPS2511 directly, but it didn't work anyway. i guess that the problem result not from the TPS61030. But whats wrong with the TPS2511. Last year i used the TPS2511 and it works fine, but there was one different to now. I exchange the Data-Lines from the output. So I only get the 5W version, not the 10W Version as last year. Maybe the constellation of the 5W Version with the current limiter resistor to pin 2 cause the problems.

    Best regards

    Julian

  • 0 in reply to Julian Pisters
    TI__Guru 58815 points

    Hello Julian,

    I am sorry, but I am not an expert on these devices. Please let me forward your thread to the right person.

  • 0 in reply to Brigitte
    TI__Mastermind 27665 points

    Hello,

    I would suggest decreasing the resistance of the current limiting resistor. Having a lower output voltage before eventually shuts off makes me believe it is somehow related to the ILIM setting. Sounds like the TPS2511 is entering into a constant current mode. 

  • 0 in reply to Adam Mc Gaffin
    Prodigy 40 points

    Hello Adam,

    thank you for your reply. I'm going to try to change the restistor from a 39k resistor to a 52.3k resistor. That means 979mA right? I will reply after testing and give you a result. 

    Thank you very much.

    Julian

  • 0 in reply to Julian Pisters
    TI__Mastermind 27665 points

    Hi Julian,

    Apologies, please decrease the resistance of the ILIM resistor. I would like for you to increase the over current threshold which requires you to decrease the resistance of the ILIM resistor. 

  • 0 in reply to Adam Mc Gaffin
    Prodigy 40 points

    Hello Adam, 

    today i tried to decrease the resistance of the ILIM Resistor, but it doesn't work anymore. Today I put not my Smartphone on it, but I put a simple device with a Li Ion Battery inside. This works fine for 10 seconds. With my Smartphone it works only for one second. When I decrease the resistor, there is no effect of the charging behavior.

    Regards,

    Julian

  • 0 in reply to Julian Pisters
    TI__Mastermind 27665 points

    Hello Julian,

    What is the value of your new resistor? 

    Also, using an oscilloscope, can you capture VIN, VOUT, DP, and DM from when you connect the phone to when it stops charging? If you have a current probe, that would also be helpful to see the current during the failure.

    Another thing you can try is to connect some type of resistance load to VBUS (no device attached). You can think slowly decrease the resistance of the load, which will increase the amount of current supplied by the TPS61032 going through the TPS2511. Can see at what current value the TPS61032 shuts down, and line this up with the amount of current that the devices could be drawing