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???
03/01/11 16:22
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 		 #181372 - 500mA backlight, but what voltage
Responding to: ???'s previous message
Whatever the answer, I would seriously consider designing a proper switcher supply with a decently wide input voltage range, e.g. 7V to 15V. A dropper resistor will be dissipating a fair amount of power, and that's not good for reliability. I'd still add a crowbar and reverse polarity protection that kicks in at your upper limit.

In my experience the correlation with inner pin diameter and supply voltage breaks down frequently.

List of 31 messages in thread
TopicAuthorDate
Overvoltage protection            01/01/70 00:00      
   comments            01/01/70 00:00      
   Trip Point Accuracy            01/01/70 00:00      
   Voltage trip and current trip            01/01/70 00:00      
   First, you must find out...            01/01/70 00:00      
      a little more info on the application            01/01/70 00:00      
         then this may be simpler            01/01/70 00:00      
            Voltage regulator as CC?            01/01/70 00:00      
               if you use a transistor for the CC ...            01/01/70 00:00      
                  And you could even limit...            01/01/70 00:00      
               Is it worth it?            01/01/70 00:00      
                  This one, e.g....            01/01/70 00:00      
                     That's the kind of thing            01/01/70 00:00      
                        CC source            01/01/70 00:00      
                           Turn the tables...            01/01/70 00:00      
                              Pros / Cons            01/01/70 00:00      
                                 Professional eqipment = be nice/forgiving to your customers            01/01/70 00:00      
                                    Never to old to learn            01/01/70 00:00      
                                       PWM it            01/01/70 00:00      
                                          PWM !            01/01/70 00:00      
                                       max 20V........            01/01/70 00:00      
                                       ignore - double posting - sorry            01/01/70 00:00      
                                       Power outage totally different            01/01/70 00:00      
                                          Power failure            01/01/70 00:00      
                                 500mA backlight, but what voltage            01/01/70 00:00      
                           A vote for your plan            01/01/70 00:00      
                              Midi switcher            01/01/70 00:00      
                                 Midi Sequencer < < Maxi Engineering            01/01/70 00:00      
                                    building a good robust product            01/01/70 00:00      
                                 Common Mode filter            01/01/70 00:00      
                                    Isn't needed in your case probably...            01/01/70 00:00      

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