Hello everyone.

I came across while reading the opto-isolator technique used for electric isolation in embedded systems/ Integrated Circuits design that " Opto-isolator is not recommended for electric isolation in power applications IC's mainly due to its dV/dt sensitivity". So I would like to know:

1)How dV/dt sensitivity affects isolation?

2)Is dV/dt sensitivity the only reason to avoid optocoupler especially in power application IC/embedded systems?

3)Are there other limitations in optocoupler which can compel one to chose other isolation techniques?

Looking forward to your suggestions and guidance. Thanks.

 

Hello,

Did you see this at Electronics Point?

What kind of optocoupler are you looking for?
There are high speed optocouplers with Diac and gate outputs:
https://www.vishay.com/docs/84925/vot8026ab.pdf
https://www.vishay.com/docs/83683/sfh6700.pdf

Bertus

 

Hello everyone.

I came across while reading the opto-isolator technique used for electric isolation in embedded systems/ Integrated Circuits design that " Opto-isolator is not recommended for electric isolation in power applications IC's mainly due to its dV/dt sensitivity". So I would like to know:

1)How dV/dt sensitivity affects isolation?

2)Is dV/dt sensitivity the only reason to avoid optocoupler especially in power application IC/embedded systems?

3)Are there other limitations in optocoupler which can compel one to chose other isolation techniques?

Looking forward to your suggestions and guidance. Thanks.

1: The isolation gap is not affected by small transients in any shape or form, however there is a breakdown voltage to the packaging, typically 5KV or 3.75KV for the smaller SMD packages.
2: Haven't read the article - but it depends on what output configuration you need in your app, transistor, darlington, digital, triac photoMOS etc
3: there are other techniques such a capacitive.... real answer depends on knowing more about your applciation