Hi,
I want to use ISO1211 for ac voltage threshold detection of 120V 60hz mains. I used "ISO121x_Threshold_Calculator_for_9V_to_300V_DC_and_AC_Voltage_Detection" excel file for resistor selection. I choose Rthr=44k and Rshunt=22k for input high voltage threshold of 97.25V.
However when I simulate the circuit using TINA, I cannot get output high. Sense node voltage is low.
I cannot find the problem on simulation. Anybody can help?
Regards,
Mehmet