fafa Posted December 30, 2005 Report Share Posted December 30, 2005 hi everyone i usually simulate my circuits in orcad capture.but there are times when i have to use ICs in them too e.gTL 494 in a switch powersupply.i cant find most ICs in the libraries given.can someone help me out here.if they are there then in which libraries should i look for them?also sometimes u also want to put somthing programmable in ur circuit like a microcontroller.is it possible to simulate such circuits in pspce? thanx Quote Link to comment Share on other sites More sharing options...
shaiqbashir Posted January 1, 2006 Report Share Posted January 1, 2006 Hi fafa!Happy new year!well! you should use the PSPICE libraries for simulating circuits in OrCAD. but i have checked myslef there is no TL494 IC present in them.Remember that OrCAD libraries doesnot have a nice collection of ICs and transistors. It is not recommended at all to use this software for simulation.Thanks Quote Link to comment Share on other sites More sharing options...
fafa Posted January 1, 2006 Author Report Share Posted January 1, 2006 but can't i get their models from somewhere? Quote Link to comment Share on other sites More sharing options...
shaiqbashir Posted January 1, 2006 Report Share Posted January 1, 2006 Hi fafa!well my dear ! this is the reason why i told you to stop using OrCAd for simulation purposes. OrCAD doesnot provide you updates regarding PSPICE libraries. You can check their website as well!www.orcadpcb.comif you find anything tell me abt that.Try using PCAD, that is professional as well as it supports update of libraries as well. ( i think so)Thanks in advance.! Quote Link to comment Share on other sites More sharing options...
fafa Posted January 3, 2006 Author Report Share Posted January 3, 2006 thanx shaiqbashirbut i have found tl494 in orcad in controller.olb.but i m unable to simulate it properly.i dont know wat i m doing wrong and i really need help.i disabled one error amplifier and am usin only one.but the out transistors donnot turn on at any stage giving me a constant Vcc output. Quote Link to comment Share on other sites More sharing options...
shaiqbashir Posted January 5, 2006 Report Share Posted January 5, 2006 in which libraries are u searching in?remember that there are two libraries. One for Capture and the other for PSPICE. The components given in the PSPICE library are able to get simulated. But the ones giving in Capture libraries cannot be simulated. Quote Link to comment Share on other sites More sharing options...
msajid Posted January 20, 2006 Report Share Posted January 20, 2006 while simulating this in Pspice A/D i get above. please help me.*Buck Converter*PWMVRAMP 1 0 PULSE (1 4 0 398U 1U 1U 1U 400U)R1 1 0 1K; dummy loadVREF 5 0 DC 12R1 5 0 1K; dummy load*AmplifierE1 7 0 8 5 30*Power CircuitVI 2 0 DC 15SI 2 3 1 7 SWITCH; includes comparatorDS1 3 2 DIODED1 0 3 DIODEL 3 8 20MC 8 0 47URL 8 0 22.MODEL SWITCH VSWITCH(VON = 0.01 VOFF = -0.01 RON = 0.1 ROFF = 100K).MODEL DIODE D.OPTIONS ITL4=20 ITL5=0 LIMPTS=0 RELTOL=0.01.PROBE V(1) V(3) V(8) V(7) I(L).TRAN 50U 25M 0 50U.END Quote Link to comment Share on other sites More sharing options...
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