- Feb 22, 2008
Switching power supplies are great for lots of power in a small package and I use them myself, but sometimes they put out spikes or transcients which can cause a problem for our laser diodes, if directly driving them off of it. I see the specs though, noise isn't very bad, maybe it will be OK. Better to buy a linear power supply, I think, but they are heavy and won't have the features this unit has at the same current capability unless expensive. It might be OK, I've used switching power supplies to drive diodes when testing etc., but one thing to be care of and tht is turning the unit on with the diode hooked up, or even a diode with a driver between it and the power supply, I killed a diode that way. These power supplies usually put out a big spike of over voltage when first turned on, regardless of the last setting. Be aware of that and you will probably be fine.
I've seen 30V spikes out of variable switching supplies before when turning them on, even with the voltage turned all the way down. 30V was the maximum output of the supply under regular conditions. Adding some 470uF 50V capacitors on the output helped smooth it out.