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switching power supply

Tim Tuba
Prodigy 60 points


Hi, i am a complete idiot when i comes to design (among other things...)

 

I have a 15 volt source that needs to be bucked to 5 volts - i am leaning towards a switching power supply because efficiency is important to this project

Also, i need to have three output ports from the regulator  to feed three different devices

 

I am not sure what kind of regulator to use and what other components that i need to create this power supply

 

any help would surely be appreciated

 

cheers,

Tim

  • 0
    TI__Guru 64590 points

    Tim Tuba said:

    I have a 15 volt source that needs to be bucked to 5 volts - i am leaning towards a switching power supply because efficiency is important to this project.

    There are existing reference designs which you can leverage for this, at least to generate a single output for 5V.  You didn't specify an output current requirement.  This will be needed to ensure you are selecting the appropriate design.

    These reference designs can be found from the Power Management Portal on the www.ti.com site.  If you want a quick power IC solution option, you can use the Power Quick Search.  However, if you would like to leverage an exisiting Reference Design, go here.

     

    Tim Tuba said:

    Also, i need to have three output ports from the regulator  to feed three different devices

    Do you need 5V for all three devices, or do you actually need 3 different voltage rails?  The above Reference Design site has examples for single output rail, which you can use to power the 3 devices provided enough current is supported in the reference design.  The site also has examples for multiple output reference designs.

  • 0 in reply to BrandonAzbell
    Prodigy 60 points

    Hi Brandon, thanks for responding to my post!

    Each device requires 5V (does that mean i need three different voltage rails? - sorry for the stupid question i am a neophyte!).  The three devices that need power are an ATmega32 microcontroller (1.1 milliAmps), a digital camera, verdex (600 Mhz ARM) Console VX.

    I plan to have a mobile power source - 5 LiSO2 batteries (3V each) for a total of 15V - need the LiSO2 batteries because i am working in -40celsius/fahrenheit

     

    thanks again for your help,

    cheers,

    Tim