SNOA999 - Zero crossing detection using comparator circuit - which diode to use?

Paul K.'s picture

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Joined: Jul 22, 2019

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SNOA999 - Zero crossing detection using comparator circuit - which diode to use?
July 22, 2019 - 2:49am

I am considering using the zero crossing circuit described in the Application Note "Zero crossing detection using comparator circuit" (SNOA999) http://www.ti.com/lit/an/snoa999/snoa999.pdf

The author states in regards to the Zener Diode to be used, that it should have "a voltage rating of 0.3V". Does this refer to the breakdown voltage?

Could anyone provide an example of a suitable zender diode for this purpose?

thanks in advance for any hints

Abhiemanyu Pandit's picture

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Joined: Jan 21, 2019

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SNOA999 - Zero crossing detection using comparator circuit - whi
July 22, 2019 - 6:33pm

It seems like that the 0.3V refers to the turn on voltage. It cannot be breakdown voltage. You also need to specify the current rating and voltage requirement along with power in Watt for your application to suggest a zener diode. as both the parameters are important. Also it seems like that you can proceed with a 5.1V zener diode.