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| BCR402R LED Driver 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 4 3 Total power dissipation, TS = 87 C Junction temperature Storage temperature Junction - soldering point1) 1For calculation of R thJA please refer to Application Note Thermal Resistance 1 2 EHA07188 Type BCR402R Marking W6s 1 = GND Pin Configuration 2 = Iout 3 = VS 4 = Rext Package SOT143R Maximum Ratings Parameter Source voltage Output current Output voltage Reverse voltage between all terminals Symbol VS Iout Vout VR Ptot Tj Tstg Value 18 60 16 0.5 330 150 -65 ... 150 mW C Unit V mA V Thermal Resistance Parameter Symbol RthJS Value 190 Unit K/W 1 Aug-29-2001 BCR402R Electrical Characteristics at TA=25C, unless otherwise specified Parameter Characteristics Supply current VS = 10 V IS Iout Symbol min. 350 18 Values typ. 440 20 max. 540 22 Unit A mA Output current VS = 10 V, Vout = 7.6 V DC Characteristics with stabilized LED load Lowest sufficient battery voltage overhead Iout > 18mA Voltage drop (VS - VCE) Iout = 20 mA Output current change versus TA VS = 10 V Output current change versus VS VS = 10 V VSmin Vdrop Iout/Iout Iout/Iout - 1.4 0.75 -0.3 2 - V %/K %/V 2 Aug-29-2001 BCR402R Total power dissipation Ptot = f(TS) Output current versus supply voltage Iout = f (VS ); Rext = Parameter Load: two LEDs with VF = 3.8V in series 500 10 -1 mW A Rext = 68 Ohm P tot Iout 300 Rext = open 10 -2 200 100 0 0 20 40 60 80 100 120 C 150 10 -3 0 2 4 6 8 10 12 14 16 V 20 TS VS Supply current versus supply voltage IS = f(VS) Application Circuit: +Vs BCR 402R 3 Load: two LEDs with VF = 3.8V in series 10 -3 Rext Vdrop 4 A IS 10 -4 1 Is 2 Iout 10 -5 0 2 4 6 8 10 12 14 16 V 20 VS 3 Aug-29-2001 |
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