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  1. P

    LTC3780 Driver

    Photos of the helmet mounted light : http://audio.peufeu.com/node/67 With 3 lights in series I will need to replace that 0.1 ohm current sense with a 0.03 ohm as it was originally intended. A bit above 6 watts, the chip's overcurrent protection trips because the resistor value is too...
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    LTC3780 Driver

    I put the thing on my website : http://audio.peufeu.com/node/66 I made a little efficiency measurement, it performs according to spec, between 90 and 95%. I couldn't find a 0.033 ohm resistor so I used a 0.1 ohm instead for the 3780's current sense control, so this limits maximum power and...
  3. P

    LTC3780 Driver

    There was a minor error in the Linear app note (you have to connect STDBY and RUN for the regulator to start). Apart from that, once soldered, it worked nicely. Dimming too. Of course it's totally overkill, but I like it. Overkill is especially the 4 layer board, but I had to order some for a...
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    LTC3780 Driver

    Boards should arrive in a few days, we'll see if it works ;)
  5. P

    LTC3780 Driver

    Hm, I think I prefer the FDS8878, lower RdsON, lower price, lower capacitance, lower gate charge (and of course, lower voltage and current but it's OK in this application). The driver needs mosfet with low gate capacitance or else it'll overheat as you say. Can you give examples of inverting...
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    High voltage and current LED driver needed

    If you cannot find what you need, perhaps you need to rethink your requirements. Higher voltages like 60V are not very easy to design for. Most of the really good MOSFETs and switching regulators are below 40V if not below 30V, due to the supremacy of the computer industry. Same thing for the...
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    LTC3780 Driver

    OK, so I want to put a light on my bike, it will have 3 White Seoul P4-U in the front and one Red Seoul P4-U in the rear. Same thing for the helmet. So, 6 LEDs total forward and 3 red ones in the back. With that I should be able to see stuff, lol. Also I have noticed that my test-rig with only...

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