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TPS2561/TPS2513 vs TPS2511

JasonHaedt
Genius 3320 points
Other Parts Discussed in Thread: TPS2513, TPS2561, TPS2511, TPS2513A

My 1st question is:  what benefit(s) are there (or maybe just differences) in implementing a USB charging circuit using the TI parts:  TPS2561 and TPS2513 to support a dual USB charger… as opposed to using 2 TPS2511 parts instead?

 

As for the testing question, we’re really looking to be certain we have a rugged solution.  For example, there are AC outlets near the USB charging ports.  We’d like to make sure any noise generated by something plugged in to the outlets (i.e. vacuum, or inductive fan motor, etc) wouldn’t be coupled into the data lines and cause issues with a tablet or phone that is charging on the USB socket.  Not that we can make it 100% bulletproof, but just wondering if TI had any application advice in that regard. “

  • 0
    TI__Prodigy 650 points

    Jason,

    TPS2511, built in both digital handshaking agrithem and power switch (70mohm), it's good for applications which needs both blocks. Sometimes, customer need low Vdroop, customer can use /CS to make compensation. But sometimes, VBUS can't be compensated, customer would prefer lower Rdson TPS2513+TPS2561/A. For example, for dual USB port, one single supply to these two port, Vdroop compensation can't be used, one port with heavy load increase the Vbus, another port with no load would also see this higher voltage.

    TPS2513, dual channel digital handshaking agrithem, adding external dual channel power switch TPS2561/A, in some application power switch may not be needed, then customer can use TPS2513 alone. In some application, which needs lower Rdson, customer may prefer to use TPS2561/A with 44mohm per channel.

    Please also take a look at our new released TPS2513A, this version is support new 2.4A iPad charging spec.

    So it's not which solution is better, but which is more close to system requirement. We intended to be very flexible for customer's different systems.

    For the second question, our device built in proper filter and deglitch timers to avoid noices and mistriggering. But from system design side, the GND needs to avoid too much noise. We met some customers' problem before, upto 1V ripple noise generated on GND, which is definitely not good PCB layout.