I added 4 AMC7135 380mA Advanced Current Regulators to the Qlite driver how many more do you think I could add before running the risk of burning up the XML2 U4 led?
Forgot to add am using high discharge batteries with it.
I believe Richard (Mountain Electronics) said they could handle 5.5A…for 14 chips total should be fine.
Agreed. But if you are using a single-cell light you wan’t get that. The most a single battery can supply to a new XM-L2 is 4.5ish amps, you’d be very lucky to see 5amps. As long as your LED has good thermal path, I don’t think it’s possible to kill your emitter on just one cell. The battery is the limiting factor, not your driver.
That’s very true and come to think of it I’ve read a few threads where people were running xml2 off a fet driver. I should have remembered that.
I don't think you'll kill one with a 7135 based driver with a single cell. That said, I think that putting any more than 4-5 chips on there will probably be a waste because you won't get any regulation anyways, even with the best cells out there.
You may be able to kill some of them with a hot 26650 and an FET driver, but the big "threat" is pushing a lot of the new ones much past 5A with a buck driver. Some of them will do 6A, but a lot won't. This makes sense because most of the constant current LED buck drivers are hysteric control based and there is a current ripple a percentage above what the average current level is. On the MAX16820 there is a 10% current ripple and the MAX16819 is 30% (higher percentage allows for lower switching speeds and smaller magnetics if your LED can handle the ripple). Most of the TI hysteretic controllers have programmable hysteretic ripple settings.
Good points think i’ll just go with 4 for this light.
Thanks everyone!