logitec Posted December 31, 2005 Report Share Posted December 31, 2005 hellocan any one help me find stbilizator that will hold 10A and will be exact 3.6Vwhile his input will be 4V Quote Link to comment Share on other sites More sharing options...
EdwardM Posted December 31, 2005 Report Share Posted December 31, 2005 Hi Logitec3.6V @ 10A IS 36W. If your converter is, say, 80% efficient, this means that the input power is 10/8*36 = 45W. Therefore the input current at 4V would be 11.25A, if this amount of current is available then you will need to design a DC-DC converter to do the task. This means learning about a number of things and experimenting as well. Learning about inductance, rate of rise of current in an inductance, properties of transistors used as a high current switch and a host of other things.However, the effort is worth it and one of the best introductions to the subject that I know of are the applications notes of the various manufacturers who produce DC-DC converters.Best of LuckEd Quote Link to comment Share on other sites More sharing options...
logitec Posted December 31, 2005 Author Report Share Posted December 31, 2005 hello EdwardM i actually meant a chip like 78L05 that stabelaizes 5Vof a circuit with exact parameters and tranzistors Quote Link to comment Share on other sites More sharing options...
EdwardM Posted December 31, 2005 Report Share Posted December 31, 2005 Hi LogitecI don't know of a linear regulator chip (like the 7805) which will do as you require with an input which is only 0.4V above the required regulated voltage and that's why I gave the answer that I did, I know that manufacturers are continually improving their products and what you need may be available real soon - but I haven't seen it ???Ed Quote Link to comment Share on other sites More sharing options...
logitec Posted December 31, 2005 Author Report Share Posted December 31, 2005 the input voltage is 4V not 0.4V and the out put3.6Vand i dont think that in my place so new components will be available to me so lets go to the other way we can do this transistor + resistor but the voltage will be juppy after the transformer so i need another chip so lets say stablize to 4V from 5Vwhere can i get one like this?and witch transistor and resistor i need? Quote Link to comment Share on other sites More sharing options...
Tony_Stoynov Posted December 31, 2005 Report Share Posted December 31, 2005 Hi,If you have a +5 you must use exactly this to make 3.6, no any reason to make 4 and then from 4 make 3.6. In post above this 0.4 V is the differences between input and output, the 0.4 V is a very small difference, many of good DC-DC chips work with different around 0.8 V, but if you have a 5 V then you have not a problem. If the input voltage is 5 and the output is 3.6 this is a 1.4 V over the regulator, this is the 14 W, not very easy to be cooled. My suggestion is use the DC-DC convertor, the LM2743/45/48 or something like this. Quote Link to comment Share on other sites More sharing options...
logitec Posted January 1, 2006 Author Report Share Posted January 1, 2006 OKbut steel i need some thing to hold the voltage and then regulate itso what chip can i use that will not burn under 10A? Quote Link to comment Share on other sites More sharing options...
ante Posted January 1, 2006 Report Share Posted January 1, 2006 Hi logitec,The LTM4600 is close but unfortunately it needs 4.5V input! Maybe you could tweak a few things to get 4.5V as input? 8) Quote Link to comment Share on other sites More sharing options...
logitec Posted January 1, 2006 Author Report Share Posted January 1, 2006 that isnt a problem and what out put it has?by the way i cant find this part at the main importer in the country so i dont think i can get it...any other more common parts? Quote Link to comment Share on other sites More sharing options...
ante Posted January 1, 2006 Report Share Posted January 1, 2006 Here you can read all about it: http://www.linear.com/micromodule/index.jsp Quote Link to comment Share on other sites More sharing options...
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