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I am designing a circuit with TL494. When I run my model in ORCAD it gives me many of this annoying error: Less than 2 connections at node. The nodes are all connected tothis TL494.
I've been told that this model is just for schematic purposes and I cannot use it for simulation. So, does anyone have any idea what I can do?
I hope I get some answers on this question since there is not similar answered question on the web as so far I've search.
The part might be just for schematic purposes and there would no model associated with it and therefore it would be ignored for the purposes of simulation - as in "no pspice template ignoring"
A quick search did not show any simulation models for this device from te manufacturers. If you have a simulation model, you might find that adding some large value, like 1G, resistors to the pins to complete the circuit.
I suspect however that this issue has nothing to do with pspice and everything to do with an incomplete circuit.
In reply to oldmouldy:
In reply to RYU1:
The question is, where did you get this model from. It doesn't seems to me an orcad provided device and for this reason your awbtl494 model is not complete.The part describing the model of D1 is missing.
Try to search the web for a complete model.
In reply to tltoth:
You are running the Lite version (demo) installation of PSpice. Lite version does not support advanced PWM model like TL494. You need to this circuit in licensed version of PSpice.
The model tl494 I used is provided by cadance (Orcad Capture)16.3 not lite version.Why the model is not working??
Check if you have PSpice with Advanced Analysis (PSpice AA) option. If not, that must cause the problem. (I mean license)
Pspice Advanced Analysis is also there...I also have the licence...
Then try to reinstall your software because your circuit (test2.zip) worked on my system.
OrCAD 16.2.0.s003 OrCAD(R) PCB Designer with PSpice(R), PSpice(R) Advanced Analysis Option
tl494 is not a pspice model. Always make sure that whenever you are simulating the models has to be from pspice. For the current part tl494 doesn't contain the pspice model. tl494/controller this part contains the pspice model you can use this component.
If the pspice model is not there then we have a workaround for that.
I'm not sure which coponent you want to use, Regulator or Controller.
When you click on add library(<install dir>\tools\capture\library\pspice) make sure you add all the libraries from this path.
Here is your circuit. There is no problem with your TL494. It has a PSpice model associated, but requires Advanced Analysis license.
So, double check your PSpice AA license and reinstall the software if necessary.