switching regulator

Discussion in 'General Electronics Chat' started by pradeeba, Jul 11, 2008.

  1. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
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    Hi all,
    Can anyone suggest me a switching regulator to boost input voltage ranges from 8 to 30V to output 12V.
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Have you looked under buck boost regulators. There are many options available. What current do you need? I have used the MC33167, which goes up to 5A.

    John
     
  3. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
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    I need 1 more switching regulator where my input voltage is from 18VAC to 265 VAC for 2W output
     
  4. hgmjr

    Moderator

    Jan 28, 2005
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    You may also want to look into a SEPIC smps power supply topology. What output power do you need from your 30V power supply?

    hgmjr
     
  5. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
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    My power supply should be able to deliver 2W output from 18VAC onwards
     
  6. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Do you mean from 18VAC to 265VAC? Have you considered something as simple as a Variac?

    John
     
  7. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
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    i have planned to use flyback topology with a constant current source circuit to power up my switcher IC at low voltage. will this work out?
     
  8. theamber

    Active Member

    Jun 13, 2008
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    What switches are you using?
    Do you have a constant AC source?
    You want to do AC clipping or you want to control the outputs of the flyback transformer individualy like with triacs?
    You have an schematic?
    For what I can put together here You want to control and regulate the output voltage of an AC source to a lower AC voltage with some type of switcher IC is this IC operating on DC?.
    Or you just want to use a Flyback transformer to build a DC regulated power supply?
     
    Last edited: Jul 11, 2008
  9. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
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    am planning to use PWM IC
    I dont have a constant AC source, planning to use Variac
    I want to use a Flyback transformer to build a DC regulated power supply
    schematic is not developed still
     
  10. theamber

    Active Member

    Jun 13, 2008
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    I am perplexed,
    you want to use a variac to build a variable DC supply?
    You want to use PWM switches in the outputs of the flyback transformer?
    Ok, I will wait to see what you intent to do.
     
  11. pradeeba

    Thread Starter Active Member

    Feb 27, 2008
    104
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    I mean to say my input will be AC.i will use a floating constant current source to power up the switcher IC. the topology what i have planned in Flyback toplogy. hope u understood
     
  12. theamber

    Active Member

    Jun 13, 2008
    318
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    You want to build a Switch mode variable PS. So what role does the variac plays?
    This file will help you.
     
  13. sudharshan.panduranga

    Active Member

    Apr 10, 2008
    61
    1
    If this is helpful use.
     
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