quinn
Newbie level 4
optocoupler design esd
I have a optocoupler input with a resistor and reverse voltage protection diode.
See basic circuit attached.
The opto is a ACPL-217-500E device from Avago and is rated for 3000Vrms isolation and 10kV/us (CMR).
My questions are as follows:
1: How does the CMR rating actually relate to ESD? (ESD tests are ns while CMR is us)
2: The product is battery powered and in a plastic enlcosure so i dont have a connection to earth for the opto input (normally use a high voltage cap) so i assume a static charge will build up in the ciruit during esd testing?
2: What more can i do to the opto input circuit to ensure it passes +/-4kV contact ESD test?.
Any suggestions/help would be greatly appreciated.
I have a optocoupler input with a resistor and reverse voltage protection diode.
See basic circuit attached.
The opto is a ACPL-217-500E device from Avago and is rated for 3000Vrms isolation and 10kV/us (CMR).
My questions are as follows:
1: How does the CMR rating actually relate to ESD? (ESD tests are ns while CMR is us)
2: The product is battery powered and in a plastic enlcosure so i dont have a connection to earth for the opto input (normally use a high voltage cap) so i assume a static charge will build up in the ciruit during esd testing?
2: What more can i do to the opto input circuit to ensure it passes +/-4kV contact ESD test?.
Any suggestions/help would be greatly appreciated.