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optocouplers ( doubling Vce?)

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Scutarius:
Hi, I want to use some optos that I have for a 100Hz application but I need a 100Vce

So, if have these optos with a Vce of 70v, that just work fine with my application (why?) can I put 2 in series to be sure that will survive the stress for a long time?

thank you

Zero999:
No, you can't put two in series and expect it to be fine because you can't guarantee that they'll both switch on at exactly the same time.

Scutarius:
do you mean that I can not say that if I put in parallel the As and Ks of the LEDs and in series the E and C of the transistors I wouldnt get the same response?

thank you

Time:
Why not just use the output side of the of the opto couplers to drive something more robust that can handle the 100V


--- Quote from: ee.jcesar on July 06, 2010, 05:55:56 pm ---do you mean that I can not say that if I put in parallel the As and Ks of the LEDs and in series the E and C of the transistors I wouldnt get the same response?

thank you

--- End quote ---

Zero999:

--- Quote from: ee.jcesar on July 06, 2010, 05:55:56 pm ---do you mean that I can not say that if I put in parallel the As and Ks of the LEDs and in series the E and C of the transistors I wouldnt get the same response?
--- End quote ---
Suppose one transistor turns on before the other?

You'll have one 70V transistor with 100V across it. It might survive for a short length of time but it might fail in the long term.

Anyway, you shouldn't put the LEDs in parallel, they should be in series.

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