Looking at driving two LED strings with a DC/DC constant current LED driver module. The constant current side can't be referenced to ground of the control circuit, so I need to have an isolated switching to choose which of the two strings I would like to drive.
I'm "only" driving 300mA current, so I was thinking of using two optocouplers to select the string I want. I am having trouble finding a optocoupler that can take 300mA continuous current. How can I change my circuit so the optocouplers can drive 300mA? Can I add another transistor?
Schematic of what I had in mind:
(note - the driver I'm using cannot handle no-load situations, so I can't just use a SPDT relay, as I will have no-load conditions during switching causing voltage spikes and god knows what other issues)