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'[PIC]: LM7805'
2002\01\13@184248 by hadirian

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Hi all,

Is there any +5V voltage regulator similar to LM7805 out there that could
withstand 40V DC in?

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2002\01\13@185802 by Brian Aase

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You might try the TL783:

http://www-s.ti.com/sc/ds/tl783.pdf

Rated up to 125VDC input, adjustable output.

-------------------------------------------------------

On 14 Jan 2002, at 12:41, Shirollah Ghadirian wrote:

{Quote hidden}

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2002\01\14@045956 by Milan Pavlica (YU7AEC)

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Why dont try to put one 7824 in front of 7805??
See you..

Shirollah Ghadirian wrote:

> Hi all,
>
> Is there any +5V voltage regulator similar to LM7805 out there that could
> withstand 40V DC in?
>
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> http://www.piclist.com hint: The list server can filter out subtopics
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title:Chief
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part 3 131 bytes
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2002\01\14@062923 by Roman Black

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Shirollah Ghadirian wrote:
>
> Hi all,
>
> Is there any +5V voltage regulator similar to LM7805 out there that could
> withstand 40V DC in?


Have you considered adding a series resistor,
if the load current is relatively constant,
or a 18v zener diode and a cap??
I have seen this in some TVs, quite common where
the load from a 7812 is reasonably constant like
a colour decoder chip. Seemed to work ok. :o)
-Roman

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2002\01\14@173959 by uter van ooijen & floortje hanneman

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> Why dont try to put one 7824 in front of 7805??
> See you..
> > Is there any +5V voltage regulator similar to LM7805 out there that
could
> > withstand 40V DC in?

In my datasheet the 7824 has 38 V as maximum input.

Wouter van Ooijen

Van Ooijen Technische Informatica: http://www.voti.nl
Jal compiler for PIC uC's:  http://www.voti.nl/jal
PICs kopen? http://www.voti.nl/shop

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2002\01\15@161256 by Madhu Annapragada

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I am not sure about the output current you need at 5V but, TL783 from TI can
withstand upto 125V input and  has an adjustable output with a max Iout of
700ma. But with 40VDC input , 5VDC output and a 22 degC package impedance to
ambient (TO220 Case), you will be able to source only about 123ma to keep
your junction temp at 120 degC (without heatsink). Now if you took your
output up to 33V say (and used a 7805 in the next stage) then you can use
the full 700ma from the TL783 and feed into the 7805.
Madhu

{Original Message removed}

2002\01\15@170732 by Milan Pavlica (YU7AEC)

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hmmmm, i have builded it and it works :)) i havent no problems with it
i think that max voltage input is about 45V DC
See you...

wouter van ooijen & floortje hanneman wrote:

{Quote hidden}


part 2 201 bytes content-type:text/x-vcard; charset=koi8-r;
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part 3 136 bytes
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2002\01\16@134255 by D. Schouten

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What about a cheap and simple LM317?

Daniel...

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Subject: Re: [PIC]: LM7805


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2002\01\16@143646 by Ted Mawson

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Just put forward-biased diodes - say a 4001 but 400x will do - in series
with the supply to the 7805.  Each diode will drop about 0.6 volt so 4
in series should drop 40v down to 37.6 volts.

Ted Mawson
http://www.portfoliopm.com

What about a cheap and simple LM317?

Daniel...

{Original Message removed}

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