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[SOLVED] FOD2741 as comparator

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el00

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Hello
I would like to detect a voltage threshold with isolation. I have found this chip: fod2741. However, I see many examples for AC applications (switching), but the voltage I want to measure (which is high voltage that I will divide through resistors divider) is a DC voltage.
I could not find any application note, will it work? I do not need to measure the voltage, just to set a threshold. In practice I want something that behaves as a comparator that outputs a trigger when the voltage goes over a certain value, but with insulation.
Thanks
 

Re: fod2741 as comparator

Hi,

I could not find any application note
Click to expand...
I don´t know where or for what you were looking ...

My recommendation:
If you want reliable informations then first go to the manufacturer´s internet pages.

Don´t search the internet for random documents. They often are not reliable.

Here the manufacturer´s product page.
The marked application note seems to be exactely what you need.
AppNote.png

Klaus
 

[SOLVED] Re: fod2741 as comparator

KlausST said:
Hi,
[...]
The marked application note seems to be exactely what you need.


Klaus
Click to expand...
Great! This is exactly what I was looking for.
I will do as per figure 8 of AN 4175, even if in my case I will attach R5 to a lower voltage, otherwise it will dissipate too much (I need to detect 15V and 180V, so I will attach R5 to the 15V rail).
Thank you.
 

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