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TPS62816EVM-140: Difference between the results of the PSpice simulation and the measured value

Danilo A.
Mastermind 27120 points
Part Number: TPS62816EVM-140

Hi Team,

We would like to ask your help regarding our customer's inquiry below

In a transient analysis, how much is the difference between the results of the PSpice simulation and the measured results?

When trying to match the results of a transient analysis simulation to actual measurements, what factors are likely to contribute most to the results?

We bought the evaluation board(TPS62816EVM-140) and conducted a test.
As a result, it was confirmed that there was a difference between the simulated and actual test values.
The simulation result shows that the undershoot is about 80 mV, while the test result on the actual device is 106 mV.
The operating conditions are as follows,
slew rate：1A/us
load current：0.6A to 5.4A to 0.6A
ON time：80us(Duty50%)
Vin：5V
Vout：1.8V
※The simulation used models published on your company HP.
※We used PSpice for TI.

So, What is the difference between the results of the simulation and the actual device?

sim_file.zip

Regards,

Danilo

  • 0
    TI__Mastermind 22840 points

    Hi Danilo,

    There will be a difference between the results from the Simulation and real-time measurements. This is quite the expectation. However, if the simulation results are completely different then we have a problem. 

    During the real measurement, the test setup (including the equipment, wires and probes used), the parasitic from the PCB, all of this contribute to the measurement results. Whereas in a pspice simulation, there are approximations and estimations made and this is the reason for the difference you see. It is not possible to quantify this difference.

    In my opinion, the measurements on the EVM is the most reliable one.

    I hope this helps.

    Regards,

    Febin