Buck Convertors

Discussion in 'Power Supplies' started by deblen, Jan 13, 2017.

  1. deblen

    deblen Apprentice Elf

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    Hi,


    I have DC-DC Buck Convertors! 12v/24v in 5v25A, what would be the maximum of these converters[font=verdana, arial, helvetica, sans-serif] could one run off a single 24v/350 watt power supply, to run 5 volt 2811 LED strips.[/font]

    [font=verdana, arial, helvetica, sans-serif]Thanks in advance.[/font]

    [font=verdana, arial, helvetica, sans-serif]Deblen[/font]
     
  2. scamper

    scamper Senior Elf

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    5v 25a is 125w . You could run a couple of these of a power supply, but I must say that is one hell of a buck converter! Just double check that is correct before designing your display around it. And I would imagine it is going to output some serious heat.
     
  3. damo1271

    damo1271 Full Time Elf Generous Elf

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    Running 2 would theoretically require 250W at maximum draw. I usually allow a max load of 80% on my power supplies (chinese cheap ones) so I wouldn't be tying to connect 3 of them to the PSU.
    Also assume the 125W is output, there will be a small loss in the conversion, say 5-10%. (275W power draw instead of 250W)

    Pixels on white draw around 60mA. Even allowing for a max 80% load will give you something like 350 pixels each if my working is correct. (700pixels per PSU)
     
  4. i13

    i13 Senior Elf

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    WS2811 and WS2812B pixels are limited to 55.5mA each.
     

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