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You can email us at info@aeng.com or call 310-216-1144 and a qualified engineer will help with your question.

Q. How can I evaluate the models in the library?
A. You can evaluate the performance of various models by reviewing one or more of the documents on the Support Page. If you have questions about a specific model's performance, please contact us directly with your question.

Q. How are the models tested?
A. Each model in the AEi Systems Power IC library is tested under various conditions using multiple test circuits for specific functions and then again in one or more full application test circuits. The results are compared to data sheet performance and in most cases actual bench measurements.

Q. What features do the transient IC models have?
A. The Power IC Library models are normally pin-for-pin compatible with the actual physical part. All key functions of the actual chip are modeled with the exception of variations with temperature. Nonlinear characteristics such as propagation delay, switching speed, drive capability and maximum duty cycle/current limits, startup phenomena are included and based on data provided by the manufacturer.

AEi Systems strives to produce models that meet all key performance metrics and exhibit “typical” performance as specified in the data sheet or performance that is within given Max-Min specifications. Smoke alarm parameters are not currently implemented.

Q. What types of simulations can I run?
A. The transient models can be used in all types of simulations including startup, line transient, load transient, and steady state, provided that the external circuit and stimulus are properly adjusted. AC stability/Frequency response simulations are also possible with the state space models provided.

Q. Can I share the models with other engineers?
A. ABSOLUTELY NOT. The license allows you to use the models with one and only one copy of PSpice. If the models are being used with multiple copies of PSpice, then one copy of the library must be purchased for each copy of PSpice.

The model libraries have special tracking codes in them so that any unauthorized sharing or distribution can be tracked back to the purchaser. Copying or distributing the models is STRICTLY prohibited and those who violate the law will be prosecuted to its fullest extent.

AEI Systems has spent many man-years developing these models. They should be thought of as software and intellectual property in every sense. Users are not allowed to distribute, post, transfer, resell, or repackage the models or any derivatives of the models.

Q. Can I use the models with other SPICE simulators?
A. Yes. If you are trying to use the models with other SPICE based simulators you will have to make sure that the simulator supports the PSpice E/G element's If-Then-Else syntax. If you need one or more of the models translated to another SPICE syntax (LTspice, HSPICE, etc.) please contact AEi Systems.

Q. How fast do the transient simulations normally take?
A. The time it takes to run a switch mode power supply simulation is directly related to a number of factors:

Your computer's performance
Complexity of the model and external circuitry
Length of the simulation
Time step of the simulator

The last item is driven by a number of factors including the stimulus and loading, soft-start and compensation components, the simulator .OPTION tolerances, the TMAX timestep setting, and the overall frequency content of the circuit (edge speeds).

It is not uncommon for SMPS simulations to take 15-30 minutes each. However, most of the example simulations run in just a few minutes. With proper setting of initial conditions and tolerances, simulation runtimes should be very reasonable given today's computer performance.

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