This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hi all,
I was trying to simulate the TPS53316 in Tina-TI and it turns the circuit did not work. The following pictures are the schematic and the waveform. It seems like the TPS53316 did nor operate in simulation.
The attachment contains the spice model and simulation files. Please help me diagnose the problem.
He, SiyuTPS53316 Simulation.zip
Siyu,
The simulation should begin to work if you change the input from a fixed voltage source to a voltage waveform and use a rise time of 100n. I am not convinced that the design will function, but the simulation does begin to switch at about 200us. Did you use WEBENCH® to design this circuit?
Please see your modified circuit below:
Siyu,
I noticed that the schematic did not seem to match the EVM guide or the datasheet example either. The datasheet design may not be correct, in that the schematic shows a Vout=1.2V, but the description states a 3.3V design. This was a little concerning to me. I did not originally check the datasheet, only the EVM guide and its circuitry as this is the same circuit that we used when we released the TINA-TI simulation.
BTW, the input does not always have to be a pulsed source. Many of the applications use the voltage supply or battery and have no issues. My experiences have shown that TINA-TI seems to prefer using the pulsed source (probably due to the way it internally handles pulsed sources vs. how it handles batteries or voltage sources). I, also, prefer to use the pulsed source so that I can control the rise and fall times of my applied signals and can tailor the source to my needs for the best solution. In this case, it appeared to me that TINA-TI performed better with the pulsed source.
Please remember that a simulator is a linear equation solver and really has no idea what you are trying to do. It is simply following a set of rules to come to a solution of the linear problem given by the circuit you have provided. If the rules change, the solution may change as well. That is why we have convergence parameters to allow the simulator to come to a "reasonable" solution. The same holds true if the elements provided have different characteristics.
With the changes made to the circuit, the fixed voltage supply or battery may work fine now.