The datasheet for the AMC7135 linear regulator shows that it needs input and output capacitors:
The cheap drivers from DealExtreme do not have those capacitors. This causes problems if you have longer wires. Apparently there is voltage surge when you turn on or off the light. After burning down two voltage controllers I added the capacitors and it cured the problem.
Now, I have a question: if I pool the AMC7135 chips - like 8 in parallel to achieve 2.8A for XM-L, do I also need to increase the capacitors? I.e. instead of 1uF input capacitor use 8uF input capacitor and instead of 0.1uF output capacitor use 0.8uF output capacitor?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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