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Electronics => PCB/EDA/CAD => Topic started by: ocset on August 10, 2017, 08:07:05 pm

Title: Required clearance for opto-isolated DALI comms signal?
Post by: ocset on August 10, 2017, 08:07:05 pm

Hello,
We have  a DALI signal which comes into our non isolated offline LED driver. The DALI signal is isolated from the receiver in the  LED driver by a TCLT1000 optocoupler..

TCLT opto datasheet
https://www.vishay.com/docs/83515/tclt1000.pdf (https://www.vishay.com/docs/83515/tclt1000.pdf)

The problem is , that its too long to fit on the PCB. We need to use a smaller opto…..

Do you think we will be able to use the LTV-356 optocoupler which is 3mm shorter….
http://www.mouser.com/ds/2/239/LTV-356T%20Series-1308-301539.pdf (http://www.mouser.com/ds/2/239/LTV-356T%20Series-1308-301539.pdf)

Will the clearance still be adequate with the LTV-356 opto? Also, if not, then can we just use a cutout in the PCB to increase clearance  like that?

Title: Re: Required clearance for opto-isolated DALI comms signal?
Post by: floobydust on August 10, 2017, 10:27:48 pm

What is your isolation voltage requirement for your product's regulatory approvals?
The product is double-insulated?