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L7987L multiple ICs in same board and how to synchronize them

Question asked by Alejandro Bizzotto on Jun 11, 2017



I'm making a DC-DC converter from +18~24V in to +/-13V, +5V out with at least 1A on each output. So far I have working the +/-13V@1.3A and I'm trying to synchronize them to have less noise. In the board I designed, I was just connecting the sync pins together but (after plug it) I realized they are referenced to a different levels of voltage so, no easy sync is possible here!

Is there a preferred way to do this? since the master will be the one with the highest frequency... how I should correct the levels if I don't know which one will be the master? Thanks in advance