-----Original Message-----
From: Michael Shiloh <michael@MAULER.SRL.ORG>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Saturday, May 15, 1999 12:58 PM
Subject: Re: [OT] High Power Voltage Regulator


>>With a linear regulator you'll have about 100
>>Watts of heat to dissipate to get 25 Watts of
>>useful power.
>
>I'm curious: How did you come up with this? Is there a rule of thumb to use
>for linear regulator efficiency?
>
>Michael
>

Useful power = 5A * 5V = 25 Watts
Heat across regulator = (24 - 5)V * 5A = 95 Watts (about 100 Watts)

Mark Walsh