AD636 with 0-230 VAC Input

Hi Ajay,

First you need to reduce the 230VAC input voltage to a value that won't destroy the AD636. For safety reasons, this is usually done with a transformer so as to isolate the ac mains from the user. To maintain accuracy, you can use a high-voltage series capacitor and resistor divider. The divider ration will be 300/5 or 60:1. In simplest terms, you could use a 59kohm resistor in series with a 1kohm.

I have attached links to an rms-dc applications guide (see pages 43 and 44) along with an application note AN-1341 (see figure 27).

http://www.analog.com/media/en/training-seminars/design-handbooks/RMStoDC_Cover-Section-I.pdf

http://www.analog.com/media/en/technical-documentation/application-notes/AN-1341.pdf

Best,

j

Hi Ajay,

First you need to reduce the 230VAC input voltage to a value that won't destroy the AD636. For safety reasons, this is usually done with a transformer so as to isolate the ac mains from the user. To maintain accuracy, you can use a high-voltage series capacitor and resistor divider. The divider ration will be 300/5 or 60:1. In simplest terms, you could use a 59kohm resistor in series with a 1kohm.

I have attached links to an rms-dc applications guide (see pages 43 and 44) along with an application note AN-1341 (see figure 27).

http://www.analog.com/media/en/training-seminars/design-handbooks/RMStoDC_Cover-Section-I.pdf

http://www.analog.com/media/en/technical-documentation/application-notes/AN-1341.pdf

Best,

j