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TPS2549: Charging port controller DCP Dual connection not charging my device

hazim mohamed
Prodigy 90 points
Part Number: TPS2549

Hello, I'm working on a basic power-bank device, where I use TPS2549 charging port controller with the same connection like the one in the example, my schematic is shown below: 

I've implemented the exact same schematic on a PCB, but when I tried to connect any Samsung mobile phone, the phone keeps showing like if someone is connecting and disconnecting the charger multiple times. When I measured the current output using a multi-meter, it's like 3 mA only.

I've tried to connect a Huawei mobile device and it was charging with only 100 mA, and it wasn't stable.

Knowing that the power source (Vout_boost) is a 5V 2A Input. 

I've connected the same schematic on a separate PCB to test it (i thought maybe it's an issue from the other circuits), but the same result is happening.

I've tried to add an output capacitor as well, which somehow stabilized the 100mA for my huawei device. but still it's too low, I want a charging current of 1 Ampere or more.

I've also tried connecting multiple different mobile devices, and I've tried to use different current limit resistor values but without any hope, I can't get more than 100 to 130 mA for my devices. and my Samsung phones are not charging at all.

Can you guide me through this issue. Correct me if I'm doing something wrong.

Regards,

Hazem.

  • 0
    Prodigy 90 points
    Update:
    I've tried using 10kOhm pullup resistors instead of the 100kOhm and I'm still having the same issue.
  • 0 in reply to hazim mohamed
    TI__Mastermind 30000 points
    Hello Hazim,

    I would double check and make sure that you have a 50.5k ohm resistor populated and not a 500k ohm resistor. Based on your description and looking at figure 42 and 43 of the datasheet, having the higher resistance populated may explain why you are seeing a lower current limit

    Also, if you are wanting a limit over 1 amp, I would recommend having a resistor value connected to ILIM_HI closer to 45k ohm
  • 0 in reply to Adam Mc Gaffin
    Prodigy 90 points
    thanks for your reply Adam,

    But Unfortunately, I've verified that it is a 50.5k ohm using the multimeter, I've also tried multiple different resistor values on the ILIM_HI pin like 20kohm, 40kohm and even 100kOhm ... The result is pretty much the same, I can tell there's no difference.

    and what do you think about the samsung mobile not being able to charge ?
  • 0 in reply to hazim mohamed
    TI__Mastermind 30000 points
    Next thing you can try is to use a scope and capture the waveforms of the DM/DP lines when a device has been connected and make sure that the proper enumeration is being done on both lines.

    Another issue could be that you do not have CS connected, but is instead floating. Would recommend following the recommended configuration to see if that helps with your issue