bcr 401r may-19-2000 1 led driver preliminary data supplies stable bias current even at low battery voltage low voltage drop of 0.75v ideal for stabilizing bias current of leds negative temperature coefficient protects leds against thermal overload eha07188 4 3 2 1 type marking pin configuration package bcr 401r w5s 1 = gnd 2 = i out 3 = v s 4 = r ext sot-143r maximum ratings parameter symbol value unit source voltage v s 18 v output current, v s = 10 v i out 50 ma output voltage v out 16 v reverse voltage between all terminals v r 0.5 total power dissipation , t s = 117 c p tot 330 mw junction temperature t j 150 c storage temperature t stg -65 ... 150 thermal resistance parameter symbol value unit junction ambient 1) r thja 280 k/w junction - soldering point r thjs 190 1) package mounted on pcb 40mm x 40mm x 1.5mm / 6cm 2 cu
bcr 401r may-19-2000 2 electrical characteristics at t a =25c, unless otherwise specified parameter symbol values unit min. typ. max. characteristics supply current v s = 10 v i s - 300 500 a output current v s = 10 v i out 9 10 11 ma dc characteristics with stabilized led load lowest sufficient battery voltage overhead i out > 8ma v smin - 1.2 - v voltage drop (v s - v ce ) i out = 20 ma v drop - 0.75 - output current change versus t a v s = 10 v i out / i out - -0.3 - %/k output current change versus v s v s = 10 v i out / i out - 2 - %/v
bcr 401r may-19-2000 3 output current versus supply voltage i out = f ( v s ); r ext = parameter load: two leds with v f = 3.8v in series 0 2 4 6 8 10 12 14 16 v 20 v s -3 10 -2 10 -1 10 a i out rext = 36 ohm rext = 82 ohm rext = 160 ohm rext = open supply current versus supply voltage i s = f ( v s ) load: two leds with v f = 3.8v in series 0 2 4 6 8 10 12 14 16 v 20 v s -5 10 -4 10 -3 10 a i s application circuit:
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