Recent content by kuksul08

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  1. K

    Circuit to distribute LED driver current

    Hmm, sounds like a challenge. Sounds like having multiple driver boards is the better solution from all points except cost.
  2. K

    Circuit to distribute LED driver current

    Interesting - with the first approach would that still rely on the LED driver before the n-mosfets or not? I am currently using an LM3409 based driver ic. I have strayed away from using linear drivers such as amc7135's due to the low efficiency.
  3. K

    Circuit to distribute LED driver current

    I have a project I'm working on and I need to distribute current from an LED driver to an array of LEDs. My ti buck driver outputs a constant 5000mA. I'd like to send that current through a circuit that will "distribute" it to some LEDs, and control that current distribution from an Arduino...
  4. K

    Power handling for UTV project - Relay selection

    Hey guys, been a long time since I've visited the forum, but still very much a flashaholic :candle: I'm working on a project that involves power distribution for a UTV - basically a relay box in which light bars can be switched on and off. Pretty straightforward. These vehicles have a typical...
  5. K

    Halogen headlight bulbs - marketing vs reality?

    Thanks so much. I must have been searching the wrong terms... the explanations in those threads was very helpful. You guys know your stuff!
  6. K

    Halogen headlight bulbs - marketing vs reality?

    Hey all, I'm looking at upgrading the headlight bulb in my motorcycle, which uses a dual halogen reflector setup with an H7 bulb in each reflector. One side is the low beam and the other is the high beam. I am aware that doing an LED or HID retrofit is not legal, and it wouldn't fit in the tiny...
  7. K

    Sanyo NCR18650GA 3.6V (3500mAh, max. 10A)

    The charge rate on this cell is ~1.5A, which is about 0.4C. My charger only charges at 1C, which is 3500mA in this case. Will I damage the cell?
  8. K

    Parallel buck drivers from the same source

    Solved! Nevermind
  9. K

    Measuring LED ripple current with a scope

    Sometimes all it takes is another set of eyes to bring out the details I may have overlooked. Thanks for looking over it with such detail - I will surely take these suggestions and alter my final board. I was concerned about the gate drive path, but just didn't see how to fix it. Guess my head...
  10. K

    Measuring LED ripple current with a scope

    Board layout as promised. Thoughts? http://i.imgur.com/GIxej5n.jpg My latest realization is how hot the circuit gets - I realized that the inductor I spec'd is very close to the saturation current. I will need to up the rating, and it wouldn't hurt to do some heatsinking.
  11. K

    Measuring LED ripple current with a scope

    I'll post up the board layout tonight. Yeah, I read in the datasheet that the layout is just as important as the component selection! Crazy to think about that. I guess these high frequencies have a tendency to make little antennas which are easily affected by adjacent components and ground...
  12. K

    Measuring LED ripple current with a scope

    Think there's any way to stabilize it, or at least stabilize the capture?
  13. K

    Measuring LED ripple current with a scope

    Right now, I am testing without a capacitor on the output. Then, I will add a cap and see what changes occur. This is the square wave I see on my FET gate: I'm not sure what the odd "ghost" I see is on the rising edges of the adjacent pulses. No adjustment to the trigger would change this...
  14. K

    Measuring LED ripple current with a scope

    I will give this a shot. I watched a really long video about measuring DC power supply ripple and learned that, well, it's not so straightforward as I thought. Indeed. I purchased it specifically for this project, but I will no doubt find a use for it as time goes on :) This is the buck...
  15. K

    Measuring LED ripple current with a scope

    Thanks for the reply SemiMan. To clarify - I am using a 10uF input cap and currently have no output cap. With my selected components, this correlates to greater than a ~400mA ripple peak-to-peak on the LEDs according to the calculations. The switching frequency at nominal input voltage is...
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