Switch regulator DC/DC

Discussion in 'General Electronics Chat' started by Danna, Jul 23, 2011.

  1. Danna

    Thread Starter New Member

    Jul 23, 2011

    I want to convert 28DC to 20DC in order to activate a laptop. The output curret of the regulator should be 5A.
    can anyone recommend a component?

    Thank you!
  2. SgtWookie


    Jul 17, 2007
    One of the easiest ways to do this yourself is to go to National Semiconductor's website at:

    and simply enter your values into the Webbench designer.
    I created a sample circuit using:
    26 for minimum Vin
    32 for maximum Vin
    20 for Vout
    5 for Iout
    Then I selected increased efficiency using the dial from 3 to 4, and opened the design for the LM3150
    The resulting schematic is attached. The simulation claims nearly 99% efficient with a load of 5A when using the recommended BOM (Bill of Materials) list.

    Since I do not know where you live or what parts might be available to you, I did not include the BOM list. You will have to use the tool, look at the components recommended, and see if you can obtain them or something very similar.
    Danna and praondevou like this.