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Buck-Boost Inverting Power Supply

Discussion in 'Power Electronics' started by The Hammer, Jan 25, 2016.

  1. The Hammer

    The Hammer

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    Sep 17, 2013
    I'm looking at creating a power supply using a UC2845BD1R2G from ON Semiconductor to create a stable 12V 10A capable power source from inside a vehicle.

    The intent is to power 6 separate LED strips inside a vehicle, and down convert again using either an LDO, or a buck converter for use by an MCU and possibly USB charge ports.

    My guess would be this should work fine, but I am just beginning with power supplies. I've read the datasheet for the most part, and it seems like it's definitely plausible. I had some questions though..

    Is there a more common chip that might be easier to work with than this? Are there any preferred "caclulators" to use when calculating the needed inductor/capacitor specs? I could do the math myself on these, but still like guides as it's my first time.

    Datasheet:
    http://www.onsemi.com/pub_link/Collateral/UC3844B-D.PDF
     
    Last edited: Jan 25, 2016
  2. BobK

    BobK

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    1,662
    Jan 5, 2010
    What is the input power? Most vehicles already have 12V or 24V power.

    Bob
     
  3. The Hammer

    The Hammer

    164
    0
    Sep 17, 2013
    12V, so atypical voltage will be about 13.6V.
     
  4. BobK

    BobK

    7,642
    1,662
    Jan 5, 2010
    So why do you need a buck / boost converter to get 12V?

    Bob
     
  5. The Hammer

    The Hammer

    164
    0
    Sep 17, 2013
    There is tolerance in most RGB LED strips to allow for common voltage changes in a vehicle despite them having an optimal/"required" voltage of 12V, but in certain setups/circumstances there may not be enough tolerance. I am developing a spectrum analyzer/N channel MOSFET PWM MCU board that might encourage people with uncommon audio/electrical systems to use this. Therefore, I want to build a controlled 12V PWM system.

    For instance, in a friends vehicle with a custom audio solution, dual battery system, and an aftermarket rebuilt alternator he hovers around 15.2V typically.
     
    Last edited: Jan 28, 2016
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