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Oliver Sedlacek
12/01/11 09:06
Read: 2533 times
Uk


 
#184969 - Crowbar circuit using TL431
Has anyone designed a crowbar circuit using the TL431 as the sensor (as per the recommended circuit in the datasheet)

I've built it but the triac never gets triggered, although the circuit does draw progressively more current as the TL431 starts conducting. Any suggestions?

List of 40 messages in thread
TopicAuthorDate
Crowbar circuit using TL431      Oliver Sedlacek      12/01/11 09:06      
   possibly worthless circuit      Erik Malund      12/01/11 09:27      
      Speed not a problem      Oliver Sedlacek      12/01/11 10:03      
         maybe it is      Erik Malund      12/01/11 10:13      
      re: possibly worthless      Andy Peters      12/01/11 10:11      
         no, the fuse blew      Erik Malund      12/01/11 10:16      
            Polyfuse - OMG      Michael Karas      12/02/11 19:05      
               And manufacturing tolerances can ruin the design...      Kai Klaas      12/03/11 06:24      
   Why not using...      Kai Klaas      12/01/11 11:39      
      Like shown here, e.g.,...      Kai Klaas      12/01/11 13:05      
         Possible but..      Oliver Sedlacek      12/02/11 01:59      
            Tell us...      Kai Klaas      12/02/11 04:51      
   describe application, and needs      Stefan KAnev      12/01/11 14:01      
      language      Erik Malund      12/01/11 14:11      
         sorry      Stefan KAnev      12/01/11 14:58      
            Awesome...      Kai Klaas      12/01/11 15:38      
         Antique...      Kai Klaas      12/01/11 15:28      
            The classic approach doesn't use a triac      Richard Erlacher      12/01/11 20:15      
               did not think opf that.      Erik Malund      12/02/11 07:54      
         Oh, come on, Erik ...      Richard Erlacher      12/01/11 20:10      
            I do not critisize language problems...      Erik Malund      12/02/11 07:57      
               It's a matter of personal pride ...      Richard Erlacher      12/04/11 09:15      
      More info      Oliver Sedlacek      12/02/11 02:05      
         and values of resistors?      Stefan KAnev      12/02/11 03:19      
            Component values      Oliver Sedlacek      12/02/11 07:20      
               oscillations?      Stefan KAnev      12/02/11 07:51      
         one alternative circuit      Stefan KAnev      12/02/11 04:33      
   a couple of questions ...      Richard Erlacher      12/02/11 17:04      
   This one's straight from "often-wrong" Wikipedia      Richard Erlacher      12/04/11 09:20      
   Thread wandering      Oliver Sedlacek      12/05/11 05:07      
      then close it..      Stefan KAnev      12/05/11 07:46      
         Problem now fixed      Oliver Sedlacek      12/06/11 01:49      
            Are you sure??      Kai Klaas      12/06/11 05:12      
               Exactly the opposite      Oliver Sedlacek      12/06/11 06:57      
                  Triac Triggering      Michael Karas      12/06/11 10:33      
                     A1 to positive rail is ok      Stefan KAnev      12/07/11 00:02      
                        Yes A1 to ++V      Michael Karas      12/07/11 08:27      
                           Nevertheless...      Kai Klaas      12/07/11 16:27      
                              Not Necessarily      Michael Karas      12/07/11 23:11      
                                 Standard for PC PSU      Per Westermark      12/08/11 04:59      

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