Re: l7805cv too hot!
From: Andrew Holme (ajholme_at_hotmail.com)
Date: 09/18/04
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Date: 18 Sep 2004 08:33:29 -0700
alex+google@vuetec.com (Quack) wrote in message news:<16197399.0409180111.6c45cff8@posting.google.com>...
> Hi,
>
> I designed a circuit running on 10v, which uses a L7805CV (morocco
> MCC1A0336)voltage regulator to give me 5v for my IC's and LED's.
>
> The problem is the 7805 gets very hot! more than enough to burn you
> finger on.
> Sometimes even cuts out (built in high temp. cutout).
[snip]
> I am out of ideas :( :(
>
> Any suggestions of what to try/look for ?
It could be oscillating. Have you checked for RF on the power
supplies? You don't mention decoupling capacitors in your post. Are
you using any? I use tantalum 2.2uF very close to the regulator
input and 100n mono ceramic very close to the output. I also use 100n
mono ceramic for each IC. I would avoid long signal / power runs and
pay due attention to layout / grounding.
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