Hi, Expart
My customers are demanding products with fail-safe function.
Does ISO1212 have a fail-safe function (double insulation structure)?
We are considering replacing the 24Vin photocouplers.
Best regurds
Takakura
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Hi, Expart
My customers are demanding products with fail-safe function.
Does ISO1212 have a fail-safe function (double insulation structure)?
We are considering replacing the 24Vin photocouplers.
Best regurds
Takakura
Hi Takakura-san,
The insulation of ISO1212 can break down under two kinds of stress conditions:
1. If the voltage rating across the barrier is exceeded: 2.5kVRMS for 1 minute or 6 kVpk surge. This condition never occurs in a 24V system.
2. If there is overvoltage on the 24V input causing overheating inside the chip. In this case, ISO1212 is designed to handle +/-60V operation in normal operation . This is the maximum voltage that can usually occur in a 24-V system. Hence damage to insulation of ISO1212 due to overheating is also prevented.
I hope this helps solve customer's concerns.
Please also take a look at http://www.ti.com/lit/an/slla370a/slla370a.pdf. This tech note highlights how ISO1212 can offer various advantages when compared to existing solutions in market.
Regards,
Anand Reghunathan
Hi Anand Reghunathan-san
Thank you for replay.
I understood what your saying. But My Customer want to know is a bit different.
[Question]
What happens to the output when an abnormality occurs in ISO 1212?
1. High 2.Low 3.Open 4.Unknown
Best Regards,
Takakura
Hi Takakura,
If there's any abnormality on the field or 24-V side, the ISO1212 outputs on the 3.3V/5.5V side will always be "Low".
Rgds,
Anant