Guest Posted March 8, 2005 Report Share Posted March 8, 2005 Hi all, I'm new here, but from the reading of the other threads, I found that this forum may provide a solution to the problems I face now. Anyway, I am tasked to design n build a DC/DC converter as the topic suggests......The input voltage is a transient voltage of 110V DC (transient at +-40%), and the intended output is either a 5V or 12V DC. I have been surfing around alot for info, and found that some designs use transformers and some dun.....please advice on which design and lay-out would be suitable. Errr kinda long for a first post.... :-X Quote Link to comment Share on other sites More sharing options...
audioguru Posted March 8, 2005 Report Share Posted March 8, 2005 Hi Twiddle,Welcome to our forum.Perhaps your post isn't long enough. It is easy to make a voltage-reducer that doesn't have any load current. Quote Link to comment Share on other sites More sharing options...
ee Posted March 8, 2005 Report Share Posted March 8, 2005 what you'd need is smps step down design however this networkrequires a control ic (most do these days) do a search withthe following keywords:smps stepdown circuit or smps stepdownapplication notes,-- most semiconductor manufacturers will have thisinformation on their websites Quote Link to comment Share on other sites More sharing options...
Guest Posted March 8, 2005 Report Share Posted March 8, 2005 Hi Twiddle,Welcome to our forum.Perhaps your post isn't long enough. It is easy to make a voltage-reducer that doesn't have any load current.Hmmmm I will try to get more details and post again, and hey cool forums here~ 8) Quote Link to comment Share on other sites More sharing options...
Guest Posted March 9, 2005 Report Share Posted March 9, 2005 I have read up on the smps step-down notes, but I have a query whether an IC can accept the high input voltage of 110V DC as stated in the 1st post. Quote Link to comment Share on other sites More sharing options...
indulis Posted December 8, 2005 Report Share Posted December 8, 2005 Can you be a little more specific about the 110VDC input voltage? Is it a "nominal" 100VDC with Quote Link to comment Share on other sites More sharing options...
smokyLED Posted December 11, 2005 Report Share Posted December 11, 2005 buck regulator or a flyback regulator with a tl494 maybe? Quote Link to comment Share on other sites More sharing options...
indulis Posted December 12, 2005 Report Share Posted December 12, 2005 A buck converter would be VERY hard to do!!! With a 5 volt output, and a nominal input of 110VDC that's a 4.5% duty cycle (plus a little for losses) and at 160VDC in it's 3.1%. Such small duty cycles are hard because of the speed at which you'd have to switch the swtching elements to keep the rest of the components relatively small. For a flyback, the leakage inductance spikes on the primary switching element could be a problem with a poorly wound coupled inductor. Quote Link to comment Share on other sites More sharing options...
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