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Part Number: ISO1212
We are using ISO1212 for Isolation purpose for 24V , 48V DC Digital Section and for AC Section of 230V AC.As per the Threshold Calculator and application note
" How to Design Isolated Comparators for ±48V, 110V and 240V DC and ACDetection TI TechNote."
We want to know how the voltage to IC pin will be less than or maintained less than 60V - as per datasheet Rshunt will take care maintaining voltage across the pin.
Can you give us explanation/ calculation details on this section how different values of Rth and Rshunt will maintain 60V
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In reply to Lucas Schulte9:
In reply to Hemalatha R66:
In the document you referred to in you earlier post there is a set of equations to calculate the needed resistor values. Other than the voltage divider,
the current through the ISO121x (2.25mA for RSENSE=560) will lead to additional drop across RTHR. The maximum voltage on the SENSE pins of the ISO121x device is 60 V. However, because the RTHR resistor drops additional voltage, the maximum voltage supported at the module inputs is higher. The values are calculated in such a way that voltage at the IC pin will not exceed 60V.
How the voltage will drop when Input = 230V AC
will voltage drop at Rth and then forms voltage divider with Rshunt
forms Voltage divider with Rshunt and then drops the voltage ?
Could you take an example and elaborate calculations how the voltage drop is seen from input voltage to IC pin.
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