dc level conversion

Discussion in 'General Electronics Chat' started by ms_kishor4u, Oct 17, 2008.

  1. ms_kishor4u

    Thread Starter New Member

    Oct 17, 2008
    5
    0
    hi to all;
    i need a ckt to convert 24V DC to 5v dc at 0.5A load current. pls suggest any ideas for that.
     
  2. boff1

    Member

    Oct 15, 2008
    26
    0
    How about a 5v regulator? Or did you have something else in mind?
     
  3. ms_kishor4u

    Thread Starter New Member

    Oct 17, 2008
    5
    0
    sir directly 7805 regulator can be sufficient?
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Yes it will be sufficient but mount a heat sink on it to remove heat faster because it will dissipate (24-5)*0.5=9.5W power as heat.
     
  5. ms_kishor4u

    Thread Starter New Member

    Oct 17, 2008
    5
    0
    is there any alternative way to remove heat sink connections
     
  6. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,670
    804
    use a switched power supply. A lot more expensive and complex usually.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at Micrel's MIC4680.
    http://www.micrel.com/page.do?page=/product-info/products/mic4680.shtml
    Download the datasheet. Have a look at the 1st schematic on the right. If you replaced R1/R2 with a 5K pot, you would have an adjustable "buck" DC-DC converter with a minimum of components (MIC4680 + 5 external components), capable of up to 1A output - and it would be far more efficient than a linear regulator.
     
  8. ms_kishor4u

    Thread Starter New Member

    Oct 17, 2008
    5
    0
    ok sir, thanq for ur solution. i can hav that. bye
     
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