BCR402U

BCR402U LED Driver • Supplies stable bias current even at low battery voltage • Ideal for stabilizing bias current of LEDs • Negative temperature coefficient protects LEDs against thermal overload • Suitable for 12V automotive applications 6 5 4 5 6 4 3 2 1 VPW09197 1 2 3 Type BCR402U Marking L2s 1 = GND Pin Configuration 2;3;5 = I out 4 = VS Symbol VS I out Vout VR Ptot Tj T stg Package 6 = R ext Value SC74 Maximum Ratings Parameter Source voltage Unit 40 65 38 0.5 500 150 -65 ... 150 V mA V mW °C Output current VS = 10 V, Vout = 8.6 V Output voltage Reverse voltage between all terminals Total power dissipation , TS = 125 °C Junction temperature Storage temperature Thermal Resistance Parameter Symbol RthJS Value Unit Junction - soldering point1) 50 K/W 1For calculation of R thJA please refer to Application Note Thermal Resistance 1 Feb-03-2004 BCR402U Electrical Characteristics at TA=25°C, unless otherwise specified Parameter Characteristics Symbol min. Values typ. max. Unit Supply current VS = 10 V IS I out 18 500 20 900 22 µA mA Output current VS = 10 V, Vout = 8.6 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 ∆Iout/Iout 1 %/V ∆Iout/Iout -0.2 %/K Vdrop 0.8 VSmin 1.4 V 2 Feb-03-2004 BCR402U Total power dissipation P tot = f (TS) Permissible Pulse Load RthJS = f (tp) 600 10 2 mW K/W P tot 400 300 R thJS 10 1 200 10 0 100 0.5 0.2 0.1 0.05 0.02 0.01 0.005 D=0 10 -6 0 0 20 40 60 80 100 120 °C 150 10 -1 -7 10 10 -5 10 -4 10 -3 10 -2 s 10 0 TS tp Permissible Pulse Load Ptotmax / PtotDC = f (tp) 10 3 Ptotmax / PtotDC - 10 2 D=0 0.005 0.01 0.02 0.05 0.1 0.2 0.5 10 1 10 0 -7 10 10 -6 10 -5 10 -4 10 -3 10 -2 s 10 0 tp 3 Feb-03-2004 BCR402U Output current versus supply voltage Iout = f (V S); Rext = Parameter VS - Vout = 1.4 V 10 -1 Supply current versus supply voltage IS = f(VS) TA = Parameter 0.002 18 Ohm 27 Ohm A 0.0016 0.0014 80°C 20°C -40°C I out 39 Ohm A IS 0.0012 0.001 0.0008 82 Ohm open 0.0006 0.0004 0.0002 10 -2 0 5 10 15 20 25 30 35 40 V 50 0 0 5 10 15 20 25 30 35 40 V VS 50 VS Output current versus supply voltage Iout = ƒ(VS), TA = 20°C VS -Vout as Parameter 10 -1 Output current versus supply voltage Iout = ƒ(VS), VS -Vout = 1.4 V TA = Parameter 0.025 -40°C A 20°C 80°C Iout Iout A 1.2V-2V 1V 0.015 0.01 0.005 10 -2 0 5 10 15 20 25 30 35 40 V 50 0 0 5 10 15 20 25 30 35 40 V 50 VS VS 4 Feb-03-2004 BCR402U Output current versus external resistor Iout = (Rext), VS = 10V, VS -V out = 1.4 V TA = Parameter 10 -1 Iout A 80°C 20°C -40°C 10 -2 1 10 OHM Rext 10 2 Application Circuit +Vs BCR 402U 4 Rext Vdrop 6 1 Is 2,3,5 Iout 5 Feb-03-2004