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Hello Team,
on customer behalf I would like to clarify discrepancy between TINA simulation and DS specs.
The schematic customer is simulating:
results from simulations:
zoomed in
From what is attached in the DS, there is discrepancy between the simulation and what is described in DS:
This is the link to the DS https://www.ti.com/lit/ds/symlink/tl431.pdf
We see that the TL431 is starting to conduct above 1V from the graph above, as from the simulation it starts about 1.8V. Also, it seems the consumed current is also different.
Could you help to understand what the reason for having these differences? Which one is correct and can we rely on the simulation results that we have for our schematic?
thanks,
regards,
Juri
Hi Juri,
Thanks for your question!
I see that the schematic has the ATL431 and not the TL431. I just wanted to confirm that this was the part that the customer is using for this simulation.
From the ATL431 datasheet, the Ika vs Vka=Vref graph is shown below. The turn-on Vref voltage is 2.5V which is the same as AM1 in the graph above.
Additionally, small current starts to flow up until the device fully turns on at 2.5V as shown below. For the ATL431, current starts to flow somewhere between 1.5V - 1.8V, and this is consistent with what the customer is seeing in their simulation.
Overall, the simulation characteristics of the ATL431 is consistent with what is on the ATL431 datasheet. For simulating with the TL431, I would recommend using the TL431 model.
I hope this helps!
Best Regards,
Andrew Li
