BARBEQUE?? That came out of my fingers as "Because"... On Tuesday, 27 November 2012 19:30:50 UTC, MrNixie (UK) wrote: > > > Hmm, I think you need to give us a bit more info - your proposed circuit, > supply voltage, etc. The mosfet and inductor won't complain much at 100C, > but your LEDs might start to! And any electrolytic caps wont be winning any > Long Service awards at those temperatures... Is the Mosfet running at this > temp barbecue it is dissipating power, or is just in a hot place to begin > with? > > Make sure you are indeed switching the Mosfet cleanly - check the Vgs > curves in the spec sheet. Remember that at high frequencies, the gate of a > mosfet just looks like a capacitor - you really have to DRIVE current in to > it - are you relying solely on the output of the SMPS IC? > > Re series and parallel LED combinations - general rule of thumb is to > arrange your LED load closest to the supply voltage, so that your SMPS is > not having to step up or down too far from the supply rail, in either > direction. You will see losses if you go for a very low voltage but high > current output, or vice-versa > > My two milliamps' worth - >
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