microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 1 copyright ? 2002 rev. 0.02, 2003-06-03 www. microsemi . com UPBLED470B high brightness blue led p roduct p review microsemi?s high brightness UPBLED470B product offers impressive brightness with industry leading thermal resistiv ity. these products deliver superior thermals that keep junction temperatures low with a remarkable package thermal resistivity 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 extremely well under extrem e temperature conditions with less wavelength shift and 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 solder reflow peak temperature (solder 10?) 225 c key features ? low thermal resistance ? rugged optomite 0603 package ? high brightness ? wide viewing angle applications/benefits ? mobile 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 b b
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 2 copyright ? 2002 rev. 0.02, 2003-06-03 www. microsemi . com UPBLED470B high brightness blue led p roduct p review ? change in radiant intensity with temperature ?1.4w/sr/c (25c < temp< 85c) ? change in radiant intensity with temperature 0.7w/sr/c (25c < temp< -40c) directivity polar plot of angular intensity % 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 = 20 ma dc drive current = 30 ma dc drive current = 50 ma 950 1250 1,600 w/sr luminous intensity i v dc drive current = 20 ma dc drive current = 30 ma dc drive current = 50 ma 50 65 75 100 mcd dominant wavelength dom dc drive current = 20 ma 468 nm peak wavelength pk dc drive current = 20 ma 460 nm chrom x chrom y dc drive current = 20 ma 0.125 0.09 angle coverage to 50% points 1/2 dc drive current = 20 ma to 50ma 140 deg. radiant flux e dc drive current = 20 ma dc drive current = 30 ma dc drive current = 50 m 2.5 3.5 5 mw luminous flux v dc drive current = 20 ma dc drive current = 30 ma dc drive current = 50 m 250 325 450 mlm forward voltage v f dc drive current = 20 ma dc drive current = 30 ma dc drive current = 50 ma 3.5 3.9 4.5 3.9 v reverse leakage current i r reverse voltage = 5 v 10 a forward voltage v f 3.9 v e e l l e e c c t t r r i i c c a a l l
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 3 copyright ? 2002 rev. 0.02, 2003-06-03 www. microsemi . com UPBLED470B high brightness 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 225c 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 4 copyright ? 2002 rev. 0.02, 2003-06-03 www. microsemi . com UPBLED470B high brightness 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 ~ 110c/ w thermal time constant ~ 20 ms (@ 0.632 x r max ). steady state temperature at ~ 500 ms. mounting footprint, copper (note: silver plating will enhance luminous intensity) t t h h e e r r m m 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, 2003-06-03 www. microsemi . com UPBLED470B high brightness blue led p roduct p review 2 3 4 5 6 1 10 4 1 10 3 0.01 0.1 forward voltage vs drive current forward voltage (volts) dc drive current (amps) 0 0.2 0.4 0.6 0 0.02 0.04 0.06 0.08 0.1 power dissipation vs drive current power dissipation (watts) dc drive current (amps)
microsemi 580 pleasant street, watertown, ma. 02472-2408, 617-926-0404, fax: 617-924-1235 page 6 copyright ? 2002 rev. 0.02, 2003-06-03 www. microsemi . com UPBLED470B high brightness blue led p roduct p review calculation for safe operation above 20 ma dc : the power dissipation must be held at a level to maintains th e junction below the maximum speci fied 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). * upbled-470b spice model .model upbled-470b d(is=1e-30 n= 1.923 rs=32 ikf=42.04 eg=3.6 cjo=63.87p + m=.1513 vj=2.02 fc=.5 isr=1.3m nr=3.4meg bv=12 ibv=369.5u + tt=432.8n xti=5) u u p p b b l l e e d d 4 4 7 7 0 0 b b a
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