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TPS2511: tps2511 unable to charger Samsung and Iphone

Teach Me
Expert 1940 points
Part Number: TPS2511

Hi TI Experts,

I have customer that would like to use TPS2511 for the car charger. But they faced some issue.

The TPS2511 does not output the appropriate charge current.

It seem like it does not switch to the correct charging mode and divider.

Tested gadgets:

  1. Samsung A7 (Battery = 2600mAh)

           Current measured = 0.6A-0.7A (not used while charging)

           Current measured = 0.7A-0.9A (used while charging)

 

  1. Iphone 4S (1432mAh)

           Current measured = 0.4A-0.5A

 

  1. Samsung Note 5 (Battery = 3000mAh)

           Current measured = 0.6A-0.7A (not used while charging)

           Current measured = 0.7A-0.9A (used while charging)

 

  1. Samsung tablet 10.1 (Battery = 7000mAh)

           Current measured = 0.4A-0.5A 

From the schematic, they set the current limit to 22Kohm (suppose able to support up to 2A as well based on calculation). The charging scheme when there is no load (measure at DM- and DP+) is Divider 2.

Since TPS2511 support autodetect features, I suppose it able to deliver max current to device. Voltage measured at Vbus= 4.9V.

Please advice,

Thanks,

Teach Me

  • 0
    TI__Mastermind 42795 points

    TPS2511 only limits current based on the current limit setting (meaning it won't change the current limit dynamically based on what is connected). The portable device (PD) is what limits the current based on what it is connected to or in some cases the VBUS voltage presented at the end of the cable to the PD.

    So, it is possible that the voltage at the end of the cable is too low so that the PD reduces it's charging current. You can try to bias up the DC voltage at the source end and see what happens (say to 5.2V or 5.3V).

    Beyond that, we would need to see detailed waveforms showing VBUS, D+, D-, and charging current in order to further assess what is happening via the PD->TPS2511 handshake.