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Boost 79xx

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CFoley1064

Jan 1, 1970
0
Subject: Boost 79xx
From: "Jean Dupont" [email protected]
Date: 7/29/2004 9:06 PM Central Daylight Time
Message-id: <[email protected]>

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

Thank you

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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