AVR-Chat

At 12:23 PM 9/24/2004, jay marante wrote:

>thanks for the reply guys...
> 
>ill trim down the input voltage to 12V. but i'll try to work it down to even a smaller input voltage.
> 
>i don't know the rating of my heatsink. anyway, my final board is already done. i was just curious why such problem and maybe i can work on it without changing my board. maybe the only way to solve it is to find a 5V relay or lower down the input voltage.

The regulator heat issue is simply the result of using a linear regulator in a high current application, with high input-output differential. Heat = (Vin-Vout)*Current