Path: utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!mailrus!ames!pasteur!ucbvax!hplabs!hp-pcd!hplsla!hpvcla!johne
From: johne@hpvcla.HP.COM (John Eaton)
Newsgroups: sci.electronics
Subject: Re: 7805 regulator
Message-ID: <5030002@hpvcla.HP.COM>
Date: 13 Jun 88 16:01:39 GMT
References: <592@picuxa.UUCP>
Organization: Hewlett Packard, Vancouver, WA
Lines: 15

<<<
< I have a question about the MC7805 5V 1A regulator. Can you parallel
< two of these devices together to derive a higher current?
----------
In a word, NO. Unless they are extremely well matched then one will wind up
with most of the load and the other will have very little. The best way is
to use a 7805 for the regulation and an external power transistor for the 
drive. The cheapest way is to use a power resistor to bypass the regulator
but this requires a known minimun load current and bad things can happen if
you aren't careful.



John Eaton
!hpvcla!johne