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Dual output DC-Dc Converters and its power ORing

Vishal Kakade
Intellectual 930 points

Hello,

I want some DC-DC converters which as both positive and negative output. (15V & 7.5V). please suggest some part numbers. I have main and redundant power supplies so how to OR the negative power?

Thanks and Regards

Vishal Kakade

  • 0
    TI__Mastermind 19080 points
    Hi Vishal,

    What's the input voltage? How much loading do you have?
    Do you mean your power supply will be 15V "OR" -7.5V?
    Please provide more detail requirement so we can see which solution will suit your application. Thanks!

    Regards,
    Sam
  • 0 in reply to Sam(MPAA) Zhang
    Intellectual 930 points

    Hello Sam,

    I have a 24V supply in my design. 

    I have 8 Op-Amps which require (+15V, -15V), and the other 8 need (+7.5V and -7.5V).

    I want to derive 15V from the 24V input and 7.5V from 12V.

    I want a regulator which can have a dual output(+15 & -15) and the other (7.5V & -7.5V). Consider 1A max current at every voltage rail.

  • 0 in reply to Vishal Kakade
    TI__Mastermind 19080 points

    Hi Vishal,

    I didn't see any dual output DC-DC converters can output positive and negative Vout.

    For 24V to +-15V, you may need two buck converters. One is configured as buck circuit to output 15V, and another is configured as buck/boost to output -15V.

    For +-7.5V output, you may follow the way used for +-15V.

    Another approach is fly-buck, which use a transformer to output positive and negative with a single buck controller at the same time. For the detail, please go to

    www.ti.com/.../overview.html

    Regards,

    Sam