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???
05/18/03 23:29
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 		 #45911 - RE: 7805 heating up....
Responding to: ???'s previous message
Mahmood,

That's impossible!

From 12V down to 3.3V at 1.5A means the regulator has to dissipate 13.05W. This will definitely heat it up! In fact, without a large area of copper underneath it to act as a heatsink, the regulator will go into thermal limiting in no time.


Rob.

List of 44 messages in thread
TopicAuthorDate
7805 heating up....            01/01/70 00:00      
   RE: 7805 heating up....            01/01/70 00:00      
      RE: 7805 heating up....            01/01/70 00:00      
         RE: 7805 heating up....            01/01/70 00:00      
   RE: 7805 heating up....            01/01/70 00:00      
   You get that with linear regulators            01/01/70 00:00      
      RE: You get that with linear regulators            01/01/70 00:00      
         RE: You get that with linear regulators            01/01/70 00:00      
            RE: You get that with linear regulators            01/01/70 00:00      
   RE: 7805 heating up....            01/01/70 00:00      
      RE: 7805 heating up....            01/01/70 00:00      
         RE: 7805 heating up....            01/01/70 00:00      
         RE: 7805 heating up....            01/01/70 00:00      
            RE: 7805 heating up....            01/01/70 00:00      
               RE: 7805 heating up....            01/01/70 00:00      
            RE: 7805 heating up....            01/01/70 00:00      
      RE: 7805 heating up....            01/01/70 00:00      
         RE: 7805 heating up....            01/01/70 00:00      
         RE: 7805 heating up....            01/01/70 00:00      
   RE: 7805 heating up....            01/01/70 00:00      
      RE: 7805 heating up....            01/01/70 00:00      
      RE: Here is my power supply circuit            01/01/70 00:00      
         RE: Here is my power supply circuit            01/01/70 00:00      
            Load Details            01/01/70 00:00      
               RE: Load Details - Incomplete            01/01/70 00:00      
         RE: Here is my power supply circuit            01/01/70 00:00      
         RE: Here is my power supply circuit            01/01/70 00:00      
            RE: Shahzad            01/01/70 00:00      
               RE:            01/01/70 00:00      
            RE: Amazing Thread            01/01/70 00:00      
               RE: Amazing Thread            01/01/70 00:00      
               RE: Amazing Thread            01/01/70 00:00      
                  RE: Amazing Thread            01/01/70 00:00      
                     RE: Amazing Thread            01/01/70 00:00      
                        RE: Amazing Thread            01/01/70 00:00      
               RE: Amazing Thread            01/01/70 00:00      
                  RE: Amazing Thread            01/01/70 00:00      
                     RE: Amazing Thread            01/01/70 00:00      
   RE: My story            01/01/70 00:00      
      RE: My story            01/01/70 00:00      
         RE: My story            01/01/70 00:00      
            RE: My story            01/01/70 00:00      
   RE: 7805 heating up....            01/01/70 00:00      
      RE: 7805 heating up....            01/01/70 00:00      

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