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AD5420 IOUT PIN PROTECTION

Question asked by JPD on Aug 7, 2018
Latest reply on Aug 9, 2018 by rrosario

Hi,

Protection on AD5420 IOUT pin

I have  Schottky diodes clamping to AVDD and GND and a 22ohm series resistor for protecting the IOUT pin of AD5420.

In spite of this additional circuitry, the part got destroyed when someone connected 24V between the current loop output terminal and Ground.

 

Can anyone please suggest a reliable protection scheme?

 

Thanks,

JayantD

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