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DC/DC inverter

Discussion in 'General Electronics Discussion' started by zemaj, Mar 22, 2011.

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  1. zemaj

    zemaj

    6
    0
    Mar 7, 2011
    Hi,

    I am having problem finding diagram or datasheet for a input 1v-30v dc/dc switch mode converter, output 12V, approx 100mA, 20mmx20mm ?

    If anyone know or heard about, please help.

    Thanks
     
    Last edited: Mar 22, 2011
  2. davenn

    davenn Moderator

    13,765
    1,920
    Sep 5, 2009
    there's many buck converter IC's available out there

    do a datasheet search on a LT1074, LT1083 just as a couple of examples

    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,477
    2,820
    Jan 21, 2010
    You want the input voltage to vary between 1V and 30V and the output to be 12V?

    You're going to have some issues for 2 reasons:

    1) The input voltage varies over a *very* wide range. Assuming you want an isolated output, this means a transformer that can store a fairly large amount of energy, and have a low enough inductance to permit the average current to rise to about 1.5A with a 1V input (and probably much higher if you consider losses in your switching elements). At 30V you will need to be able to provide very short pulses to keep the output voltage down. If you don't want an isolated output then you have the complication of a design that can both boost and buck.

    2) The low minimum input voltage will possibly make starting your inverter very difficult. You may require a separate higher voltage source to power parts of your circuit.

    I would be very surprised if such a device could be found "off the shelf" anywhere.
     
  4. davenn

    davenn Moderator

    13,765
    1,920
    Sep 5, 2009
    I may have misunderstood what he was referring to
    info lacking to make an informed response

    D
     
  5. zemaj

    zemaj

    6
    0
    Mar 7, 2011
    DC/DC converter

    Thats correct.

    I need a IC or a method that would do both buck and boost operations.

    Sorry, for not given enough information

    Thanks
     
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