XHP70.2 at full power of 30W through two channels.

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Lexel
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LouieAtienza wrote:
Lexel wrote:
LouieAtienza wrote:
There may be other advantages to a MCPCB like this… for a mounted light, you could make the light “directional” by dimming one channel and brightening the other – like for a stationary vehicle light that still “turns” with the vehicle, or “points” up or down with the terrain… possibly with a cross fader or stacked pot.

think about the thermal stresss in the LED if only one side heating up, also would affect the beam negatively, your directional idea would not work like you think, you can make that with 2 indipendant LEDs and optics
there is no benefit of such a MCPCB it generates only disadvantages

They do make color-mixing LEDs with four separate dies on one chip that can be individually activated/dimmed; sure they’re designed as such but for something that’s momentary, like a few seconds, I don’t see it as a big deal.. but I won’t blow my own $20 LED to find out…

There are also color-mixing optics – hybrid reflector/TIR – tat work with color-mixing chips to give even output regardless of intensity of each die on the chip as well…

but XHP70.2 are usually driven pretty hard, have seen enough XHP70.2 with 2 dead dies in the past, the flip chip seem to be a bit fragile compared to first generation

on the other hand I can build 20mm diameter drivers with up to 8A output and 95% efficiency at 6A, so why making this big driver that can do only 4A?

svitlo
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Lexel][quote=LouieAtienza wrote:
Lexel wrote:
LouieAtienza wrote:
There may be other advantages to a MCPCB like this… for a mounted light, you could make the light “directional” by dimming one channel and brightening the other – like for a stationary vehicle light that still “turns” with the vehicle, or “points” up or down with the terrain… possibly with a cross fader or stacked pot.
..

but XHP70.2 are usually driven pretty hard, have seen enough XHP70.2 with 2 dead dies in the past, the flip chip seem to be a bit fragile compared to first generation

on the other hand I can build 20mm diameter drivers with up to 8A output and 95% efficiency at 6A, so why making this big driver that can do only 4A?

If we compare the driver to 6A and the driver to two channels 2 to 3A, then 2 channels
It will be much easier, more reliable and have a small cost.

Scallywag
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svitlo wrote:
Scallywag wrote:

I want to use the two channels to strobe each half of the XHP70.2 alternately. I'd say, something like 10 Hz, and less than 50% duty cycle, 180° out of phase.

Even more fun if you use two separate strobe frequencies cool

Interesting idea. And why the frequency of 10 Hz?

 

I just picked an obnoxious frequency.

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Lexel
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svitlo][quote=Lexel wrote:
LouieAtienza wrote:
Lexel wrote:
LouieAtienza wrote:
There may be other advantages to a MCPCB like this… for a mounted light, you could make the light “directional” by dimming one channel and brightening the other – like for a stationary vehicle light that still “turns” with the vehicle, or “points” up or down with the terrain… possibly with a cross fader or stacked pot.
..

but XHP70.2 are usually driven pretty hard, have seen enough XHP70.2 with 2 dead dies in the past, the flip chip seem to be a bit fragile compared to first generation

on the other hand I can build 20mm diameter drivers with up to 8A output and 95% efficiency at 6A, so why making this big driver that can do only 4A?

If we compare the driver to 6A and the driver to two channels 2 to 3A, then 2 channels
It will be much easier, more reliable and have a small cost.


nothing wrong with this, but you can simply use them in parallel connected togerther not split up at the MCPCB
Whitewalker
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Svitlo, do you work at Beriled? I’m trying to buy this driver but having problems with the purchase. Can you offer any advise?

svitlo
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Whitewalker wrote:
Svitlo, do you work at Beriled? I’m trying to buy this driver but having problems with the purchase. Can you offer any advise?

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