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Topic Title: ATEX : serial zener diodes
Topic Summary: Use of zener diodes in series for a zener barrier
Created On: 24 September 2015 02:43 PM
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 24 September 2015 02:43 PM
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Concret

Posts: 2
Joined: 24 September 2015

Hi there,
I am not sure to be in the right place for my question, please redirect me if i am not.

I am currently designing an ATEX design and I encounter some trouble with a zener barrier.
I did all the math and found a power dissipation that is unreachable with the components I have in my disposition.
So here is my question :
When designing a zener barrier can I use zener in series in order to split the power dissipation ?
For exemple, if I need a 12V zener with a power dissipation of 2W, can I use two 6V zener in series with a power dissipation of 1W ?

Thank you in advance for your answers !
 28 September 2015 08:16 AM
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oneye

Posts: 201
Joined: 25 February 2008

You could use 2 zener diodes in series - but is it a good design and would it be safe under fault conditions ?

And could you get your design not only approved but Certified ?
 28 September 2015 08:26 AM
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Concret

Posts: 2
Joined: 24 September 2015

Hi,
Thank you for your repply !
The design must be certified for ATEX IIC. I am using a serial resistor to limit the current + a self resetable fuse to protect the zener.
Use of 2 zener in serie (for IIC I need in fact 4 zener, 2 // 2) could be use in a certified design ?
It is the first time I have to made an ATEX design and it is not very simple without example, so I am sorry if my questions seem to be "stupid".
Regards.

Edited: 28 September 2015 at 04:08 PM by Concret
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