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Diff between Switching reg and ldo

Discussion in 'Electronic Design' started by [email protected], May 23, 2008.

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  1. Guest

    Hi All,

    I just wonder if any one give me the Advantages of Switching regulator
    over LDO (linear regulator) and which are the situations where we can
    use Switching regulator and the linear regulator. I have some idea on
    the switching regulator and how it works but i do want to know the
    exact the differences they use .....

    Thanks and regards
    Srikanth
     
  2. Guest

    The advantage of switching regulators is that they don't dissipate
    much heat - they are usually around 90% efficient, so for every 9
    watts you feed into your load, you only dissipate one watt in the
    switching regulator.

    A linear regulator supplying 3.3V from a 10V rail only 33% efficient -
    you'd have to dissipate at least 6.7 watts in a linear regulator to
    deliver 3.3 watts to the load in that situation, and you'd need a
    correspondingly bigger heat sink.
     
  3. Phil Allison

    Phil Allison Guest


    ** Switching regulators reduce the cost of a given voltage regulator
    esign - sometimes by a large factor !!

    There is usually little or no cost advantage at low power levels - ie a few
    watts.

    Sometimes, the high frequency noise associated with fast switching circuits
    is not acceptable since it will adversely affect the circuit that is being
    supplied.

    It all depends on the specifics of the application.

    As always.



    ...... Phil
     
  4. In addition to the other responses, switching regulators can be used
    to boost the input voltage, and also to reverse the polarity so you
    can get, for example, +5v, +15v, -5v, -15v from a single 6v dc source.

    Not that anyone uses 15v anymore.
     
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