Excessive Heat with LM1084IT-5.0/NOPB and LED Strip

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hello all,

i using makerduino uno board drive 30 led/m neopixel strip, have 3m section of. of being powered 12v 9ah sla battery, lead me add 5v 5a voltage regulator required 5v led strip. strip spec'd @ 2a/m max current...

i'll include images, , try explain many configurations i've tried: main problem, works, within 10 secs of powering on, reg hot enough burn skin...after 15 secs lights start act erratic , disconnect power.

i have tested regulator , putting out 5v

i have tested current flowing out of 12v battery , saw 1.5a while strip active
i have tested current on 5v output reg , saw 1.5a while strip active...

in current configuration 12v battery supplying voltage vin arduino , reg
i tried isolating arduino power disconnecting vin battery , running arduino usb power...and reg got hot.

am using regulator incorrectly???

in schematic view led strip not included, 3 pin header, wiring there correct, left right gnd, data, +5v...

thanks in advance time  :smiley-wink:

you going need heatsink, , maybe rather large heatsink.

the power dissipated in linear voltage regulator calculated voltage drop across regulator (7v in case) multiplied current.  7v x 1.5a = 10.5w.  that's 10.5w worth of heat.

in order 5a out of thing, might need lower voltage drop , use heatsink.   i haven't studied datasheet, there may maximum power rating (usually specified "infinite heatsink" @ room temperature) voltage & current limits.

a switching regulator more complicated (it requires inductor) switching regulators can 100% efficient.   that means can more current out put in (with less voltage out, of course).  in addition reducing heat, battery last longer.


Arduino Forum > Using Arduino > General Electronics > Excessive Heat with LM1084IT-5.0/NOPB and LED Strip


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