Opamp polarized supply

Discussion in 'General Electronics Chat' started by msr, Sep 7, 2010.

  1. msr

    Thread Starter Active Member

    Jul 8, 2008
    62
    1
    Hello,

    How can I power an opamp with polarized supply? I mean, how can I get the "V-"?
    Can someone sugest me a circuit or IC?

    Requirements
    Input: 5V (or 3.3V)
    Output: -5V (or -3.3V)
    Small size

    Thanks in advance!
     
  2. Dyslexicbloke

    Active Member

    Sep 4, 2010
    420
    19
    You would need some sort of switching converter for that, they are available as monolythic circuits CPC stock them, as would many other supplyers I am sure.
    (Asuming you dont want to try and build one.)
    Are you stuck with those rails?
    where is your 5v / 3.3v coming from?
     
  3. Dyslexicbloke

    Active Member

    Sep 4, 2010
    420
    19
    Have a look at :-
    http://cpc.farnell.com/jsp/level5/module.jsp?moduleId=cpc/506853.xml
    The output is isolated so you can configure tham however you want to just treat them as if they were batteries .. connecting the positive output to your ground will mean thet the negative output is now a -V rail.
    you would only need 1 and your existing 5V.

    Just one simple way ... there are probably loads of other solutions.

    Hope this helps
    Al
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
  5. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    I've used these in the past. Minimal parts count but very little current:

    http://www.maxim-ic.com/datasheet/index.mvp/id/1357/t/al

    Samples are avaialble in PDIP and surface mount.

    Mouser sells a line of converters as well, totally isolated and available in many different regulated configurations.
     
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