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Optocoupler technology

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IconicPCB:
For example Meanwell RSP-750 can be connected in series but it calls for isolated floating control voltage sources so as to be able to vary output from 20% to 110% .

 I can take the analog "linear " path with optocouplers or A PWM optocoupler output and convert to analog voltage but i had hoped these gate drivers would have a bit more grunt which would make the PWM path much simpler...that is no need for a power supply...

ali_asadzadeh:
what would be the life expectancy of these Optocouplers?

spec:

--- Quote from: ali_asadzadeh on January 19, 2019, 08:50:17 am ---what would be the life expectancy of these Optocouplers?

--- End quote ---
For a top-tier optocoupler from the likes of Vishay: 100k hours after which the CTR will be at least 50%.

https://www.vishay.com/docs/80059/80059.pdf

The two main alternatives to opto coupling are capacitive and inductive, both of which have an 'infinite' life and are very fast.

ali_asadzadeh:

--- Quote ---The two main alternatives to opto coupling are capacitive and inductive, both of which have an 'infinite' life and are very fast.
--- End quote ---
Thanks for the tip, do we have a cheap option on them?

zitt:
Even these SMT optos are pretty big by today's standards. Glad they exist; but was kind hoping for something even smaller.

I get that most of the apps are for physical isolation... but there are time when we are just trying to keep systems from directly connecting.

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