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Boost 79xx

Discussion in 'Electronic Basics' started by Jean Dupont, Jul 30, 2004.

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  1. Jean Dupont

    Jean Dupont Guest

    i look for Bosting power supply the negative voltage with 79xx
    Please cess me for explication

    Thank you
     
  2. CFoley1064

    CFoley1064 Guest

    Subject: Boost 79xx
    Hi, Jean. I guess if you get enough responses you can fill a cess pool.

    I'm assuming you're expressing a need for more current from a 79XX regulator.
    One thing you might want to try is looking at the data sheet. On page 9 of the
    On Semi data sheet for the 79XX regulators, there's a sample circuit for using
    two power transistors and a few low ohm resistors to current boost a 7905 to 4
    amps. Your load regulation won't be quite as good as a 79XX by itself, but
    it's OK for most applications. Watch your layout, read the datasheet, and be
    sure to use a good high frequency cap at the output (1 uF is good).

    http://www.onsemi.com/pub/Collateral/MC7900-D.PDF

    Good luck
    Chris
     
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