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