Hi all,
I am looking for a 350 ... 700 mA driver that will take 2 x CR123A for a P60 drop-in (single mode) but I can't seem to find any. I am trying to build a (budget) low-output long-battery-life drop-in (using an XPG or XML).
* An AMC7135-based driver would be inefficient since it is linear. However, I do wonder whether such a driver would work on 2 x CR123A (reliably, long term). I think it should: According to the datasheet the max voltage is 6V (absolute max is 7V), I am guessing that 2 x CR123A produces less than 6V under load, and 7135-based drivers seem to have a diode that lowers voltage with 0.7V or so.
* A PT4225-based driver would probably not work since the min voltage is 6V. Moreover, all 17 mm driver boards seem to be discontinued.
* An AX2002-based driver like the ones in the URL's below might work. It seems that the current can be changed by swapping out an SMD resistor. However, I am not sure if the other components would still be well dimensioned for the low-current case, especially with the 5W board.
http://dx.com/p/3-6v-9v-800ma-regulated-ic-circuit-board-for-cree-and-ssc-leds-4-pack-3256
http://dx.com/p/18v-5w-cree-circuit-board-for-flashlights-16-8mm-5-5mm-26110
* A ZXC310-based driver like the one in the URL below might work (description mentions "C310" chip). Same comments as for the AX2002-based driver above. This does seem like a simple and robust circuit though.
http://www.miniinthebox.com/3-6v-9v...leds-4-pack_p219487.html?pos=ultimately_buy_7
* A Micropuck would probably work for the 350 mA case. However, they are significantly more expensive than the drivers above, and I would need some kind of "blank" driver PCB to close the pill, which I have not found yet.
Any answers, comments and/or suggestions are greatly appreciated.
Thanks,
I am looking for a 350 ... 700 mA driver that will take 2 x CR123A for a P60 drop-in (single mode) but I can't seem to find any. I am trying to build a (budget) low-output long-battery-life drop-in (using an XPG or XML).
* An AMC7135-based driver would be inefficient since it is linear. However, I do wonder whether such a driver would work on 2 x CR123A (reliably, long term). I think it should: According to the datasheet the max voltage is 6V (absolute max is 7V), I am guessing that 2 x CR123A produces less than 6V under load, and 7135-based drivers seem to have a diode that lowers voltage with 0.7V or so.
* A PT4225-based driver would probably not work since the min voltage is 6V. Moreover, all 17 mm driver boards seem to be discontinued.
* An AX2002-based driver like the ones in the URL's below might work. It seems that the current can be changed by swapping out an SMD resistor. However, I am not sure if the other components would still be well dimensioned for the low-current case, especially with the 5W board.
http://dx.com/p/3-6v-9v-800ma-regulated-ic-circuit-board-for-cree-and-ssc-leds-4-pack-3256
http://dx.com/p/18v-5w-cree-circuit-board-for-flashlights-16-8mm-5-5mm-26110
* A ZXC310-based driver like the one in the URL below might work (description mentions "C310" chip). Same comments as for the AX2002-based driver above. This does seem like a simple and robust circuit though.
http://www.miniinthebox.com/3-6v-9v...leds-4-pack_p219487.html?pos=ultimately_buy_7
* A Micropuck would probably work for the 350 mA case. However, they are significantly more expensive than the drivers above, and I would need some kind of "blank" driver PCB to close the pill, which I have not found yet.
Any answers, comments and/or suggestions are greatly appreciated.
Thanks,
