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TPS2511: Can we connect the output of usb ports in parallel to get higher current out.

joe nemer usa1
Prodigy 80 points
Part Number: TPS2511

I am using the TPS2511 for usb charging ports. 3 individual customer ports. Each is set to limit at 1.5A.
My company now is inquiring to allow the customer to take the 3 outputs of the 3 usb ports and connect them in parallel (using a special passive connector) to drive a 5v @ 4.5A external device..
Will it work?
What will happen?
Should we allow them to do it?
Any other comment?
Thanks

Joe

  • 0
    TI__Intellectual 1920 points
    Hi Joe,

    Do you have any details on the special passive connector?

    Regards,
    Donovan
  • 0 in reply to Donovan Porter
    Prodigy 80 points
    Donovan,
    nothing special. take the output of the 3 USBs and connect then together to get 3*1.5A. to drive a 5vload at 4.5A
    joe
  • 0 in reply to joe nemer usa1
    TI__Intellectual 1920 points

    Hi Joe,

    Will the TPS2511s be configured as CDPs or DCPs?  All three ports are powered by the same supply correct?

    Regards,
    Donovan

  • 0 in reply to Donovan Porter
    Prodigy 80 points

    yes all 3 tps2511 are powered from the same source. I am using the same schematics suggested on the datasheet. see attached.  D+ and D- will be open on the customer side, however, I suggest to the customer how to hook up the data  lines on their side if it makes difference.

    thanks

    joe

  • 0 in reply to joe nemer usa1
    TI__Intellectual 1920 points
    Hi Joe,

    Do you know how the passive connector will work? If the connector just ties all three of the 3 ports data lines (3 D+ lines together and the three D-
    lines together) I'm not sure if the BC1.2 DCP detection will work properly. In DCP mode, the D+ and D- lines are shorted by a 200 ohm resistor in the TPS2511. In order to detect a DCP the portable device, in this case the passive connector, needs to output 0.6V on the D- line. The portable device then monitors the D+ line and the voltage should be close to the 0.6V or at least greater than 0.3V. If all three port's D+ lines and D- lines are shorted together, then I'm not sure if the detection will work properly. However, if the connector can independently communicate with each port, then they should be correctly recognized as DCP ports and there shouldn't be any issues tying the three OUT lines together to supply 4.5A max.

    Regards,
    Donovan