ADC -> uController +DAC or MCU -> MCU?
On another support thread a TI engineer suggested potentially stacking multiple digital isolators to achieve higher isolation voltages:
As the voltage experienced by each one off the isolators would be directly proportional to their impedance we worry about unbalances.
Thus, some questions:1. Are the impedances of these chips somewhat controlled? (this would give us a window of fluctuation)
2. Do you have some data on the tests performed doing that?
3. How would the powering work? Do the isolated power supplies have even higher impedance than the isolator chips? Or would they be the weakest link?What about the ISOW7840? I imagine that one would not supply enough power to power a second unit, would it?
This could potentially be huge for us if we indeed could do that. Thus, I hope you can help.
Hi VVolt,Thank you for posting to E2E! Yes, it is possible to achieve higher isolation voltages by stacking digital isolators in series. For additional context, please also refer to the thread below:Our data is limited in this practice, but impedance is proportional to distribution of voltage stresses between series isolators.
I hope this information is helpful. Please expect my follow up early next week and feel free to ask additional questions meanwhile.Thank you,Manuel Chavez
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In reply to Manuel Chavez:
Hi VVolt,Hopefully all is well. As mentioned above, our testing indicates isolation performance improves when using isolators in series, and distribution of high-voltage stresses across them is proportional to the impedance of each device. I can share data with you directly if you send me a Request to Connect or Personal Message.Respectfully,Manuel Chavez
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