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TPS7A3501 paralleling

Ivan Jurcic
Prodigy 10 points
Other Parts Discussed in Thread: TPS7A3501

Is there a simple way to parallel two TPS7A3501, and still maintain most of its performance?

I get the impression that two of these devices can be paralleled by tying their NR pins together, EN pins together, GND pins together, output and sense pins together.  Maybe the NR pins could be tied together through a 1k resistor or less to narrow the reference voltage.  I am assuming that the output MOSFET has a positive temperature coefficient, and the error amplifiers have similar input offset voltages.

For a side question, can I narrow the output voltage range for separate non-paralleled TPS7A3501 which still share the same supply rail by tying their NR pins directly, or through resistors?

  • 0
    TI__Genius 13245 points

    Hi Ivan,

    Unfortunately, as you concluded,  tying the NR nodes together does not guarantee equal current sharing because the error amplifiers will have independent offset voltages, and these offset voltages are not guaranteed by a min./max. spec.

    Using ballast resistors is the only easy way to guarantee that one of the TPS7A35 devices does not carry more than 1A.  See the following app. note:

    http://www.ti.com/lit/an/slva250/slva250.pdf

    I hope this helps-

    Regards,

    Mike