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Parallel operation of TPS40054

Matthias Stockhaus
Prodigy 30 points
Other Parts Discussed in Thread: TPS40055, TPS40054, TPS40422, TPS40131, TPS40140, TPS40322, UCC39002, TPS55386

In my actual design I use a TPS40055 (24V input, 3.1V output 15A). But I need more output current and I read in the datasheet that the TPS40054 allows paralleling of converters.

From the datasheet:

"The TPS40054 operates in one quadrant and sources output current only, allowing for paralleling of converters
and ensures that one converter does not sink current from another converter. This controller also emulates a
non-synchronous buck converter at light loads where the inductor current goes discontinuous. At continuous
output inductor currents the controller operates as a synchronous buck converter to optimize efficiency."

These are the only informations I get until now.

Do I have to change my design or is it possible to operate two my converters?

  • 0
    TI__Genius 17240 points

    Hi Matthias,

    For higher current, I would suggest a 2-phase converter instead of paralleling two converters. In that way, the two phases can operate with a clock of 180 degree phase difference so that the input/output ripple current can be reduced, or the size of inductor, input/output capacitors can be reduced for the same specifications. We have several controller IC which support 2-phase operation, e.g. TPS40322, TPS40422, TPS40140, and TPS40131. These controllers also have current-sharing loop to maintain the load current equally distribued between the two phases.  

    If you still prefer to parallel two converters, it is possible to parallel two controlled by TPS40054. For current-sharing, you may need a loadshare controller like UCC39002.

    Regards,

    Na

  • 0 in reply to Na Kong
    Intellectual 455 points

    Dear Sir

    I also like TPS404022. In datasheet only show some 2 circuit in 2 phase. Would you please add total example cirucit -2 phase application- in datasheet ? You may refer TPS55386, There is very clear in datasheet about 2 phase application.

    Just a suggestion.

    Best Regards,

    Kami Huang

  • 0 in reply to Kami Huang
    TI__Genius 17240 points

    Hi Kami,

    You can refer to the following post regarding the 2-phase application of TPS40422.

    http://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/p/182783/660568.aspx#660568

    Regards,

    Na

  • 0 in reply to Na Kong
    Intellectual 455 points

    Hello Na

    I know how to connector wire of TPS40422. I just suggest more clear for reading fig. in datasheet. Actuality, about dual phase TPS40422 datasheet is easy to read  for me. Thanks for your kindly help.

    I have other question about TPS40422 PMBUS command and GUI. Would you please give me a hand?

    Best Regards,

    Kami Huang