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6v to 5v convertion for usb

Discussion in 'Electronic Design' started by [email protected], Dec 11, 2006.

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  1. Guest

    Hello my friends,

    I'm really new in this and i wonder if someone caould
    help me on how to convert a 6V 300mA to 5V, in order to
    get power from a usb

    thanks in advance
  2. Guest


    Can i use a resistor for this? how can i calculate the Ù required?
  3. Paul Burke

    Paul Burke Guest

    USB power is nominal 5V, not 6V...
  4. Joel Kolstad

    Joel Kolstad Guest

    Perhaps you mean power *to* a USB device? No (correctly functioning) USB hub
    will provide you with 6V.

    To convert 6V to 5V, you'd use a low-dropout regulator. Go to a
    manufacturer's web page such as TI's here:
    ....and enter your specs.

    ---Joel Kolstad
  5. maxfoo

    maxfoo Guest

    My guess is he probably wants to convert 5V USB power to 6V at 300mA for some
    widget he has.
  6. Guest

    Ï/Ç maxfoo Ýãñáøå:

    I have 6V 300mA , and I am trying to make it 5V to give power to a USB

    thank you all for your answers my friends
  7. Paul Burke

    Paul Burke Guest

    A USB what? It might help us to help you if you tell us what actual
    device you are trying to use. A USB host already supplies power, up to
    100mA at power-up and 500mA after enumeration, so at that power level
    there's not much need for an external power supply. If you haven't got
    a host, there's not much you can do with USB, apart from light an LED or
    charge a battery. But if you insist, get a 5V output, LDO (low dropout)
    regulator. i assume you will be using stripboard or some such to build
    it on, so something in a TO220 package, say an LM2940, might be readily
  8. Joel Kolstad

    Joel Kolstad Guest

    ....or power some really cheesy amplified speakers.
    ....or a little desk fan.
    ....or a beverage cooler.
    ....or warmer!

    ....etc... it's amazing how ubiquitous the USB connector has become for
    low-power, logic-level power supplies!
  9. Guest

    Ï/Ç Paul Burke Ýãñáøå:

    Actually I have a set of hp flat panel speakers, that I want to
    connect to another monitor. these speakers take power via a usb
    and the monitor I have has just an output that gives 6v .
    So I think I must convert this 6V to 5V in order to avoid burning the
    speakers' USB
  10. Didi

    Didi Guest

    So I think I must convert this 6V to 5V in order to avoid burning the
    Just put two 1n4007 diodes or something like that in series and your
    speakers should be fine, they can't need that precise a power supply.

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