LED Driver BCR402W Datasheet Revision 2.0, 2012-04-12 Power Management & Multimarket Edition 2012-04-12 Published by Infineon Technologies AG 81726 Munich, Germany © 2012 Infineon Technologies AG All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics. With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation, warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices, please contact the nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements, components may contain dangerous substances. For information on the types in question, please contact the nearest Infineon Technologies Office. Infineon Technologies components may be used in life-support devices or systems only with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. BCR402W Revision History Page or Item Subjects (major changes since previous revision) Revision 2.0, 2012-04-12 All Datasheet layout updated Table 2-1 Vout limit increased Table 2-3 Rint limits tightened Trademarks of Infineon Technologies AG AURIX™, C166™, CanPAK™, CIPOS™, CIPURSE™, EconoPACK™, CoolMOS™, CoolSET™, CORECONTROL™, CROSSAVE™, DAVE™, DI-POL™, EasyPIM™, EconoBRIDGE™, EconoDUAL™, EconoPIM™, EconoPACK™, EiceDRIVER™, eupec™, FCOS™, HITFET™, HybridPACK™, I²RF™, ISOFACE™, IsoPACK™, MIPAQ™, ModSTACK™, my-d™, NovalithIC™, OptiMOS™, ORIGA™, POWERCODE™; PRIMARION™, PrimePACK™, PrimeSTACK™, PRO-SIL™, PROFET™, RASIC™, ReverSave™, SatRIC™, SIEGET™, SINDRION™, SIPMOS™, SmartLEWIS™, SOLID FLASH™, TEMPFET™, thinQ!™, TRENCHSTOP™, TriCore™. Other Trademarks Advance Design System™ (ADS) of Agilent Technologies, AMBA™, ARM™, MULTI-ICE™, KEIL™, PRIMECELL™, REALVIEW™, THUMB™, µVision™ of ARM Limited, UK. AUTOSAR™ is licensed by AUTOSAR development partnership. Bluetooth™ of Bluetooth SIG Inc. CAT-iq™ of DECT Forum. COLOSSUS™, FirstGPS™ of Trimble Navigation Ltd. EMV™ of EMVCo, LLC (Visa Holdings Inc.). EPCOS™ of Epcos AG. FLEXGO™ of Microsoft Corporation. FlexRay™ is licensed by FlexRay Consortium. HYPERTERMINAL™ of Hilgraeve Incorporated. IEC™ of Commission Electrotechnique Internationale. IrDA™ of Infrared Data Association Corporation. ISO™ of INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MATLAB™ of MathWorks, Inc. MAXIM™ of Maxim Integrated Products, Inc. MICROTEC™, NUCLEUS™ of Mentor Graphics Corporation. MIPI™ of MIPI Alliance, Inc. MIPS™ of MIPS Technologies, Inc., USA. muRata™ of MURATA MANUFACTURING CO., MICROWAVE OFFICE™ (MWO) of Applied Wave Research Inc., OmniVision™ of OmniVision Technologies, Inc. Openwave™ Openwave Systems Inc. RED HAT™ Red Hat, Inc. RFMD™ RF Micro Devices, Inc. SIRIUS™ of Sirius Satellite Radio Inc. SOLARIS™ of Sun Microsystems, Inc. SPANSION™ of Spansion LLC Ltd. Symbian™ of Symbian Software Limited. TAIYO YUDEN™ of Taiyo Yuden Co. TEAKLITE™ of CEVA, Inc. TEKTRONIX™ of Tektronix Inc. TOKO™ of TOKO KABUSHIKI KAISHA TA. UNIX™ of X/Open Company Limited. VERILOG™, PALLADIUM™ of Cadence Design Systems, Inc. VLYNQ™ of Texas Instruments Incorporated. VXWORKS™, WIND RIVER™ of WIND RIVER SYSTEMS, INC. ZETEX™ of Diodes Zetex Limited. Last Trademarks Update 2011-11-11 Datasheet 3 Revision 2.0, 2012-04-12 BCR402W Table of Contents Table of Contents Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1 1.1 1.2 1.3 LED Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 7 7 2 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Datasheet 4 Revision 2.0, 2012-04-12 BCR402W List of Figures List of Figures Figure 1-1 Figure 3-1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 4-1 Figure 4-2 Figure 5-1 Figure 5-2 Figure 5-3 Datasheet Pin configuration and typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Total Power Dissipation Ptot = f(TS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Permissible Pulse Load RthJS = f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Permissible Pulse Load Ptotmax / PtotDC= f(tp) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Output Current versus VS Iout = f(VS), 2 LEDs load with VF = 3.8V in series, Rext = Parameter. . . . 12 Supply Current versus VS IS = f(VS), 2 LEDs load with VF = 3.8V in series. . . . . . . . . . . . . . . . . . . 12 Output Current versus Rext Iout = f(Rext), VS = 10 V, Vout = 7.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Output Current versus Vdrop Iout = f(Vdrop), VS = 10 V, Vout = 7.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . 13 Application Circuit: Stand alone current source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Application Circuit: Supply voltages > 18 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Package Outline for SOT343 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Package Footprint for SOT343 (dimensions in mm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Tape and Reel Information for SOT343 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5 Revision 2.0, 2012-04-12 BCR402W List of Tables List of Tables Table 2-1 Table 2-2 Table 2-3 Table 2-4 Datasheet Maximum Ratings at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Resistance at TA = 25 °C, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Characteristics at TA = 25 °C, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . DC Characteristics with stabilized LED load at TA = 25 °C, unless otherwise specified . . . . . . . . . 6 9 9 9 9 Revision 2.0, 2012-04-12 BCR402W LED Driver 1 LED Driver 1.1 Features • • • • • • • • • • LED drive current preset to 20 mA Output current adjustable up to 60 mA with an external resistor Easy paralleling of drivers to increase current Supply voltage up to 18 V High current accuracy at supply voltage variation Low voltage overhead of 1.2 V Up to 500 mW power dissipation in a small SOT343 package Negative thermal coefficient of -0.3 %/K reduces output current at higher temperatures RoHS compliant (Pb-free) package Automotive qualified according AEC Q101 1.2 • • • • • SOT343-3D Applications Channel letters for advertising, LED strips for decorative lighting Aircraft, train, ship illumination Retrofits for general lighting, white goods like refrigerator lighting Medical lighting Automotive applications like CHMSL and rear combination lights 1.3 General Description The BCR402W is a cost efficient LED driver to drive low power LEDs. The advantages towards resistor biasing are: • • • • homogenous light output despite of varying forward voltages in different LED strings homogenous light output of LEDs despite of voltage drop across long supply lines homogenous light output independent from supply voltage variations longer lifetime of the LEDs due to reduced output current at higher temperatures (negative thermal coefficient) The advantages towards discrete solutions are: • • • • lower assembly cost smaller form factor higher reliability due to less soldering joints higher output current accuracy due to pretested LED drivers Dimming is possible by using an external digital transistor at the ground pin. The BCR402W can be operated at higher supply voltages adding LEDs between the supply voltage VS and the power supply pin of the LED driver. You can find further details in our application notes. Datasheet 7 Revision 2.0, 2012-04-12 BCR402W LED Driver The BCR402W is a perfect fit for numerous low power LED applications by combining small form factor with low cost. These LED drivers offer several advantages to resistors like significantly higher current control at very low voltage drop ensuring high lifetime of the LEDs. Pin Configuration Typical Application +VS 3 VS Rex t (optional ) 4 GND 1 IOUT 2 4 Rex t 3 VS Vdrop Rex t GND 1 IS I OUT 2 Iout Figure 1-1 Pin configuration and typical application Type Marking BCR402W W6s Datasheet Pin Configuration 1 = GND 3 = VS 2 = IOUT 8 Package 4 = Rext SOT343 Revision 2.0, 2012-04-12 BCR402W Electrical Characteristics 2 Electrical Characteristics Table 2-1 Maximum Ratings at TA = 25 °C, unless otherwise specified Parameter Symbol Values Unit Min. Typ. Max. Supply voltage VS - - 18 V Output current Iout - - 60 mA Output voltage Vout - - 18 V Reverse voltage between all terminals VR - - 0.5 V Total power dissipation Ptot - - 500 mW Junction temperature TJ - - 150 °C Storage temperature range TSTG -65 - 150 °C Note / Test Condition TS ≤ 95 °C Attention: Stresses above the max. values listed here may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. Table 2-2 Thermal Resistance at TA = 25 °C, unless otherwise specified Parameter Symbol Values Min. Typ. Unit Note / Test Condition Max. 1) Junction - soldering point RthJS 110 K/W 1) For calculation of RthJA please refer to Application Note AN077 (Thermal Resistance Calculation) Table 2-3 Electrical Characteristics at TA = 25 °C, unless otherwise specified Parameter Symbol Values Min. Unit Note / Test Condition Typ. Max. - - V IC = 100 µA, IB = 0 Collector-emitter breakdown voltage VBR(CEO) 18 Supply current IS 350 440 540 µA VS = 10 V DC current gain hFE - 150 - - IC = 50 mA, VCE = 1 V Internal resistor Rint 33 38 45 Ω IRint = 10 mA Output current Iout 18 20 22 mA VS = 10 V Vout = 7.6 V Voltage drop (VRext) Vdrop - 0.76 - V Iout = 20 mA Table 2-4 DC Characteristics with stabilized LED load at TA = 25 °C, unless otherwise specified Parameter Symbol Lowest sufficient supply voltage overhead VSmin Values Unit Note / Test Condition Min. Typ. Max. - 1.2 - V Iout > 8 mA Output current change versusTA ∆Iout/Iout - -0.3 - %/K VS = 10 V Output current change versus VS ∆Iout/Iout - 2 - %/V VS = 10 V Datasheet 9 Revision 2.0, 2012-04-12 BCR402W Typical characteristics 3 Typical characteristics 600 500 Ptot [mW] 400 300 200 100 0 0 20 40 60 80 TS [°C] 100 120 140 Figure 3-1 Total Power Dissipation Ptot = f(TS) RthJS [K/W] 100 D=0 D = 0.005 D = 0.01 D = 0.02 D = 0.05 D = 0.1 D = 0.2 D = 0.5 10 1 -6 10 10 -5 10 -4 -3 10 tp [s] 10 -2 10 -1 0 10 Figure 3-2 Permissible Pulse Load RthJS = f(tp) Datasheet 10 Revision 2.0, 2012-04-12 BCR402W Typical characteristics Ptotmax / PtotDC 100 D=0 D = 0.005 D = 0.01 D = 0.02 D = 0.05 D = 0.1 D = 0.2 D = 0.5 10 1 10-6 10-5 10-4 10-3 tp [s] 10-2 10-1 100 Figure 3-3 Permissible Pulse Load Ptotmax / PtotDC= f(tp) Datasheet 11 Revision 2.0, 2012-04-12 BCR402W Typical characteristics Iout [mA] 100 10 1 Rext = open Rext = 68 Ω 0 2 4 6 8 10 VS [V] 12 14 16 18 IS [A] Figure 3-4 Output Current versus VS Iout = f(VS), 2 LEDs load with VF = 3.8V in series, Rext = Parameter 10 -3 10 -4 10 -5 0 2 4 6 8 10 VS [V] 12 14 16 18 Figure 3-5 Supply Current versus VS IS = f(VS), 2 LEDs load with VF = 3.8V in series Datasheet 12 Revision 2.0, 2012-04-12 BCR402W Typical characteristics 60 50 Iout [mA] 40 30 20 10 0 10 100 Rext [Ω] 1000 Figure 3-6 Output Current versus Rext Iout = f(Rext), VS = 10 V, Vout = 7.6 V 10 -1 Iout [A] 10-2 10 -3 10 -4 10 -5 0.6 0.65 0.7 0.75 0.8 0.85 Vdrop [V] 0.9 0.95 1 Figure 3-7 Output Current versus Vdrop Iout = f(Vdrop), VS = 10 V, Vout = 7.6 V Datasheet 13 Revision 2.0, 2012-04-12 BCR402W Application hints 4 Application hints +V S 3 VS 4 Rex t (optional ) Vdrop Rex t GND 1 IS Iout 2 I out Figure 4-1 Application Circuit: Stand alone current source +V S 3 VS 4 I S + I out Rex t (optional ) Vdrop Rex t GND 1 IS Iout 2 I out Figure 4-2 Application Circuit: Supply voltages > 18 V Application hints BCR402W serves as an easy to use constant current source for LEDs. In stand alone application an external resistor Rext can be connected to adjust the current between 20 mA and 60 mA. Rext can be determined by using Figure 3-6. Connecting a low tolerance resistor Rext will improve the overall accuracy of the current sense resistance formed by the parallel connection of Rint and Rext leading to an improved current accuracy. Please take into account that the resulting output currents will be slightly lower due to the self heating of the component and the negative thermal coefficient. Please visit our web site www.infineon.com/lowcostleddriver for detailed application notes. Datasheet 14 Revision 2.0, 2012-04-12 BCR402W Package 5 Package 0.9 ±0.1 2 ±0.2 0.1 MAX. 1.3 0.1 A 1 2 0.1 MIN. 0.15 1.25 ±0.1 3 2.1 ±0.1 4 0.3 +0.1 -0.05 +0.1 0.15 -0.05 +0.1 0.6 -0.05 4x 0.1 M 0.2 M A SOT343-PO V08 Figure 5-1 Package Outline for SOT343 (dimensions in mm) 1.6 0.8 0.6 1.15 0.9 SOT343-FP V08 Figure 5-2 Package Footprint for SOT343 (dimensions in mm) 0.2 2.3 8 4 Pin 1 2.15 1.1 SOT323-TP V02 Figure 5-3 Tape and Reel Information for SOT343 (dimensions in mm) Datasheet 15 Revision 2.0, 2012-04-12 BCR402W Terminology Terminology ∆Iout/Iout Output current change hFE DC current gain IEN Enable current ILED LED current Iout Output current IR Reverse current LED Light Emitting Diode PCB Printed Circuit Board Ptot Total power dissipation PWM Pulse Width Modulation RB Bias resistor Rext External resistor Rint Internal resistor RoHs Restriction of Hazardous Substance directive RthJS Thermal resistance junction to soldering point TA Ambient temperature TJ Junction temperature TS Soldering point temperature Tstg Storage temperature VBR(CEO) Collector-emitter breakdown voltage VBR Breakdown voltage Vdrop Voltage drop Vout Output voltage VR Reverse voltage VS Supply voltage VSmin Lowest sufficient supply voltage overhead Datasheet 16 Revision 2.0, 2012-04-12 w w w . i n f i n e o n . c o m Published by Infineon Technologies AG