Re: ARC-LS circuit boost
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php_44 said:
The original poster was inquiring about the rev 1 circuit. Wasn't that boost circuit built with discrete parts (transistors, caps resistors, etc) and an inductor? It was capable of running on a single 1.5V cell, or a 3V lithium or
[email protected] pack. It was loosely voltage regulated, and so probably had no current sense resistor. It may still be capable of being tweaked, but you'd have to extract a schematic from the circuit board and experiment.
The later rev lights (from the hybrid series on up through rev 2 and beyond) had an IC based boost circuit based on a part from Linear Technologies - this circuit (shared with some boards from the sandwich shop) was current regulated and did have a sense resistor. This circuit can be adjusted for current output by changing the sense resistor.
Is my memory right?
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I have just looked at the rev 1 circuit. It didn't use any discrete transistors. It used two switcher ICs running in parallel. There is no way to hotrod this circuit. It is already running "balls to the wall" and is limited by the onboard current limiting of the ICs. It would be possible to reduce the output to one-half by disabling one of the two ICs.
Your memory is correct about the hybrid and up circuits. My original response in this thread was based on the assumption that the original question was about the hybrid and up designs.