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Hi-current buck converter

Discussion in 'General Electronics Chat' started by iqlogic, Apr 29, 2013.

  1. iqlogic

    Thread Starter New Member

    Jul 18, 2011

    I need high power buck converter for my RC car. I'm using 2S and 3S LiPo batteries in my car. I have LM2596 buck converter but it has low current (only 3A max. I want to add more powerful buck converter - something about 20-25A. I found something on eBay (12A buck converter) but it doen't fit to my car, so I have to build my own.
    So please, could somebody help with this problem? All I need is schematic for buck converter with output 6V/20-25A. And schematic for 12A buck converter from eBay will be great too. :)

    Many many thanks

  2. crutschow


    Mar 14, 2008
  3. iqlogic

    Thread Starter New Member

    Jul 18, 2011
    TPS53353 is an interesting product but I need 6V and it has max Vout only 5.5V :(

    And 250W/20A Buck converter is really powerful converter but I need something custom made because of dimension of my car :)

    But many thanks for your tips, maybe I can use it in future projects ;)
  4. bountyhunter

    Well-Known Member

    Sep 7, 2009
    I don't understand what you are doing. If you need a high-current 6V source, why don't you just reconfigure the battery pack so it is two Li cells in series and then parallel that with other two cell sets to get the current you need.

    A 30A buch converter is going to burn a lot of power.
  5. iqlogic

    Thread Starter New Member

    Jul 18, 2011
    I need constant 6V and fullycharged LiPo cell has 4,2V so I can't get 6V from batteries. Switching regulators have pretty nice efficiency (often more than 90%) and I have heatsink for it ;)

    I have this 12A buck converter but I cannot find any datasheet for it and part number on regulator is scratched :mad:

    It will replace UBEC on my RC car because I need more power for servos, lighting, winch etc. :)