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???
02/28/11 16:53
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 		 #181344 - Voltage regulator as CC?
Responding to: ???'s previous message
Do you know what voltage the backlight needs?

You might be able to use a low voltage low dropout voltage regulator as constant current generator that uses a series resistor to control the current. But this only works if the actual voltage needed for the backlight is less than regulator voltage + dropout voltage. A 3V LDO with 1V dropout would allow max 9-4 = 5V to the backlight. A 1.2V LDO with 0.2V dropout would allow 7.6V regulation range.

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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