Very large inductor? Not necessarily. Inductor size increases both with conductor width and with inductance value. This specific driver isn't meant to handle 2 cells in series, it is meant to efficiently drive low Vf emitters at high currents with just single cell input. Thus, no large inductance value is required which saves inductor size:
The above inductor is just of 470nH value (very very small), and pretty sure it is a high current handling inductor. It is the exact recipe for a single cell high current buck driver, which on the other hand is a smart choice as it offloads a lot of heat from the driver which otherwise would be burnt in the MOSFETs like it happens in all of the newer Convoy 5A and 6A linear drivers. Given the requirements (low emitter Vf and pretty high current) the above design is a completely logical and smart choice. Kudos for this.
P.S.: 8A? Wow! I think that is a bit “on the edge”, but well…
Please Simon can we have constant frequency strobes in your lights (e.g. 10Hz) instead of the alternating/two frequency strobes. You are losing lots of sales to light painting photographers by not having a constant frequency strobe in Biscotti and 12 Mode UI.
Hello Simon,
I want to swap emitter and driver on the just arrived Z1, but can’t figure out how to disassemble the driver section?
Can you give me the right direction please?
At what point should culpm1 consider optimal distance? If you look the picture above, you see its beam small vs xhp35 and sbt90.2 which apparently much wider range, but those distance are fall short for this culpm1 bcos closer look it has much higher intensity of light, as in the picture, I think this light should aim further to make it clear. I still wait for more beamshot from Convoy new L21A CULPM1…
Sadly the Osram red driver is only 2.5A. It performs best at 3.5A but 3A would have been ideal….oh well
At 2.45A I get 178 lumens
At 3.5A I get 235 lumens
That’s a large difference for the red led
I’m still happy to have a driver though. At 2.45A it’s still good usable lighting up to 200m. It still gives 4 times the performance than using a red filter.