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TPS61178: Paralleling dcdc converters

PieterT
Intellectual 565 points
Part Number: TPS61178

Hey everyone,

Bit of a unique situation, but I plan on connecting the output of about 5 small battery packs together. They batteries will at some point probably be at different voltages and therefore I need to regulate the output voltage prior to connecting them. 

I'm therefore going to use the TPS61178 to boost the voltage from an input range of 5.4 to 8.4V to  a regulated 12V. 

My question is I'm not sure whether I'll experience any issues connecting the output of say 5 of these devices on the same bus. Are there any precautions I need to take?

I'm worried about whether the devices control might be affected or whether some form of reverse current will flow. 

Any help will be appreciated. Thanks in advance!

  • 0
    TI__Mastermind 46905 points

    Hi Pieter,

    try to understand your requirement

    1. there will be five battery pack and five TPS61178 circuit

    2. the output of the TPS61178 is connected togther.

    if so, there is not reverse current into the VIN, but the current balancing through each TPS61178 is a concern. 

  • 0 in reply to Jasper Li
    Intellectual 565 points

    Hi Jasper,

    That's completely correct. There will be 5 battery packs and each will have a TPS61178.

    The idea is to be able to remove a battery pack or add one as needed. 

    Is there anyway to make this work well? Especially concerning the current balancing issue you brought up.

    Looking for a modular and efficient design

    Thanks for all the help.

  • 0 in reply to PieterT
    TI__Mastermind 46905 points

    Hi Pieter,

    there is no simple solution to balance the current through the five converter. the TPS61178 circuit acts as voltage source, but now we have five voltage source connected together.