Help me

Discussion in 'The Projects Forum' started by the kid, Jan 6, 2015.

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  1. the kid

    Thread Starter Member

    Jan 4, 2015
    58
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    I have a problem about making an negative regulator, which have parameters following
    + Vin = 40 V
    + Vout = -12V
    +Iout = 1A
    I need schematics not use transformer. Help me please
    Thank you every one seeing the thread!!
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    use a LM7912 regulator..
     
  3. the kid

    Thread Starter Member

    Jan 4, 2015
    58
    1
    Sory, i have only input, with is 40VDC. I want to make a negative voltage -12 V from the input without pulse transformer. I need a schematic buck-boost converter.
     
  4. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,392
    1,606
    How many outputs do you have? If there is just the single -12V output then the aforementioned LM7912 will do the trick, along with many other devices equally simple and suitable.

    If you are using the input for a positive output then sorry kid, it cannot be done without a transformer (for isolation) inside a switching converter.
     
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  5. the kid

    Thread Starter Member

    Jan 4, 2015
    58
    1
    I found an application of LM 2576. but it's starting current too high, about 2A. and efficient low, about 60 %
    [​IMG]
     
  6. bertus

    Administrator

    Apr 5, 2008
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    the kid likes this.
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