microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 1 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review microsemi?s high brightness UPBLED470L product is a new led which features a low forward voltage for low power consumption. this offers impressive brightness with industry leading thermal resisitivity. these products deliver superior thermals that keep junction temperatures low with a remarkable package thermal resisitivity of 110 degrees c/watt. the blue packages also deliver a very wide viewing angle able to easily integrate into optical lenses. the optomite package performs extrem ely well under extreme temperature conditions with less wavelength shift an d intensity degradation seen by many competitors. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com for operation of these leds in pulse mode applica tions, devices may be us ed in conjunction with the microsemi lx1992led drivers absolute maximum ratings at 25o c (unless otherwise specified) thermal characteristics (unless otherwise specified) thermal resistance symbol value units junction-to soldering point r js 110 c/w parameters symbol value unit dc forward drive current i f 30 ma peak forward current i fp 100 ma led operating junction temper ature tj -40 to +150 c reverse voltage v r 8 v power dissipation p d 125 mw operating temperature t opr -40 to +125 c storage temperature t s -45 to +150 c electrostatic discharge esd 1000 v esd classification class 2 key features ? low thermal resistance ? rugged optomite 0603 package ? low forward voltage ? high brightness ? broad angular emission applications/benefits ? mobil phone keypad ? panel, button, switch indicators. ? backlighting ? signage ? signals and marker lights u u p p b b l l e e d d - - 4 4 7 7 0 0 l l
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 2 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review ? change in radiant intensity with temperature ?1.2w/sr/c (25c < temp< 85c) ? change in radiant intensity with temperature 0.6w/sr/c (25c < temp< -40c) electrical parameters @ 25 c & id=20 ma (unless otherwise specified) characteristic symbol test conditions min typ. max units radiant intensity i e dc drive current = 5ma dc drive current = 10ma dc drive current = 20ma dc drive current = 30ma 180 350 645 900 w/sr luminous intensity i v dc drive current = 5ma dc drive current = 10ma dc drive current = 20ma dc drive current = 30ma 35 15 26 45 60 mcd dominant wavelength dom dc drive current = 20ma 469 nm chrom x chrom y dc drive current = 20ma .137 .066 angle coverage to 50% points 1/2 dc drive current = 5ma to 50ma 140 deg. radiant flux e dc drive current = 5ma dc drive current = 10ma dc drive current = 20ma dc drive current = 30 ma 0.5 0.92 1.7 2.4 mw luminous flux v dc drive current = 5ma dc drive current = 10ma dc drive current = 20ma dc drive current = 30ma 45 75 125 170 mlm full width half max fwhm dc drive current = 20ma 33 nm forward voltage v f dc drive current = 5ma dc drive current = 10ma dc drive current = 15ma dc drive current = 20ma dc drive current = 30ma 2.88 2.97 3.05 3.11 3.22 3.1 v reverse leakage current i r reverse voltage = 5 v 10 a
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 3 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review directivity polar plot of angular intensity % typical angular distribution of radiant and luminous intensity 0.25 0.5 0.75 1 polar plot of rel. ang. intensity angle -90 to +90 relative angular intensity (%) u u p p b b l l e e d d 4 4 7 7 0 0 l l
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 4 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review bottom view notes: anode is identified by observing the underside of the led. (anode is the smaller of the two base pads) mount to circuit board using 60/40 pb/sn or equivalent. maximum solder melt exposure temperature is 260c for 10 seconds. tape and reel 3,000 units/reel notes: dimensions is shown in metric. m m e e c c h h a a n n i i c c a a l l
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 5 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review 1 10 3 0.01 0.1 1 50 100 150 thermal resistance vs power-on time power-on time (sec) thermal resistance (c/watt) steady state thermal resistance junction-to-optomite base metal ~ 110 c thermal time constant ~ 20 ms (@ 0.632 x r max ). steady state temperature at ~ 500 ms.
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 6 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review 2.8 2.9 3 3.1 3.2 3.3 3.4 0 5 10 15 20 25 30 35 40 45 50 forward voltage (volt) dc drive current (ma) 0 10 20 30 40 50 0 10 20 30 40 50 60 70 80 90 100 dc drive current (ma) luminous intensity (mcd)
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 7 copyright ? 2002 rev. 0.02, 2003-01-15 www. microsemi . com UPBLED470L low voltage blue led p roduct p review calculation for safe operation above 20 ma dc : the power dissipation must be held at a level to maintain the junction below the maximum specified operating temperature. duty cycle control may be used to establish th e safe operating condition using a train of pulses. led junction temperature may be calculated by use of the following: t j t case v f i dpk . t p r js . 1 t p z t p . z z tp . t case v f i dpk t p r js t p z t p z z tp t case is at a specified temperature. v f and i dpk values are read off graph of forward voltage vs drive current. t p and are set by the on-time and pulse period of the drive circuit. thermal impedances ( z ) and thermal resistance ( r ) values are read from thermal impedance graph. conversion of 1931 x y coordinates to 1960 u v coordinates: u = 4x/(-2x + 12y + 3) , v = 6y/(-2x + 12y +3) conversion of 1960 u v coordinates to 1931 x y coordinates: x = 3u/(2u ? 8v +4), y = 2v/(2u ?8v +4). u u p p b b l l e e d d 4 4 7 7 0 0 l l
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