I have a heatsink to be mounted, but for the moment, there should be no
power consumption, so I thought that the power to be dissipated is
small.

Lucian

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Aadu Adok
Sent: 14 mai 2004 15:48
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: ] Cascading Regulators

> this ? Because when I power the board, the 7805 gets very hot
> quickly and I had to pull it off (there is no power
> consumption as I haven't planted all the IC's yet). I am

it has to drop 13.8 - 5 = 8.8 volts.
if you IC-s are consuming, let's say 200mA (only you know the exact
value) then the power dissipation on 7805 would be 8.8 * 0.2 = 1.76
watts. I guess it will get quite hot without heatsink.

aadu

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