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02/07/10 18:54
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 		 #172959 - voltage regulator design
I had an interesting project to design a voltage regulator with the following specs:
Input + 12VDC battery.
Outputs: -5VDC, +3.3VDC, +5VDC non isolated.
Total Current drawn from battery is 330mA.
Trying to simplify the design I came out with this idea:

The problem with this design is that the voltage between 3.3v and 0v is not regulated until current drawn between the 0v and -5vd is greater then the current drawn from 3.3v and 0v.
Do you know how to fix this problem or do you have other ideas?
Mahmood

List of 30 messages in thread
TopicAuthorDate
voltage regulator design            01/01/70 00:00      
   Implement an "Inverting Buck-Boost"...            01/01/70 00:00      
      ultra low noise            01/01/70 00:00      
         You're right ...            01/01/70 00:00      
   reghardless of the urban legends and ...            01/01/70 00:00      
   You need a rail splitter            01/01/70 00:00      
      no, he does not            01/01/70 00:00      
         When the Engine starts            01/01/70 00:00      
            Engine?            01/01/70 00:00      
               Ummm...            01/01/70 00:00      
         That's not a given ...            01/01/70 00:00      
         I stand by what I said            01/01/70 00:00      
            Which one?            01/01/70 00:00      
               Rail splitter            01/01/70 00:00      
                  It isn't as simple as it looks.            01/01/70 00:00      
                     it is ...            01/01/70 00:00      
                        Did you even read the original spec's?            01/01/70 00:00      
                           reverse engineering            01/01/70 00:00      
                  Let me try ..            01/01/70 00:00      
                     Reply            01/01/70 00:00      
                        Reply            01/01/70 00:00      
                  Like this            01/01/70 00:00      
                     This should work well            01/01/70 00:00      
                     The problem with the TLE2426 is...            01/01/70 00:00      
                        quite true, that's why the op-amp is better            01/01/70 00:00      
                           Link....            01/01/70 00:00      
                              probably still too weak ...            01/01/70 00:00      
                                 ...and instable...            01/01/70 00:00      
                        True, opamp alternative            01/01/70 00:00      
                           There are several            01/01/70 00:00      

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