LED Drivers for Low Power LEDs BCR25W Data Sheet Revision 2.1, 211-4-27 Industrial and Multimarket
Edition 211-4-27 Published by Infineon Technologies AG 81726 Munich, Germany 211 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.
Revision History Page or Item Subjects (major changes since previous revision) Revision 2.1, 211-4-27 7 Features updated Revision 2., 211-3-3 All Preliminary status removed Trademarks of Infineon Technologies AG AURIX, BlueMoon, C166, CanPAK, CIPOS, CIPURSE, COMNEON, EconoPACK, CoolMOS, CoolSET, CORECONTROL, CROSSAVE, DAVE, EasyPIM, EconoBRIDGE, EconoDUAL, EconoPIM, EiceDRIVER, eupec, FCOS, HITFET, HybridPACK, I²RF, ISOFACE, IsoPACK, MIPAQ, ModSTACK, my-d, NovalithIC, OmniTune, OptiMOS, ORIGA, PRIMARION, PrimePACK, PrimeSTACK, PRO-SIL, PROFET, RASIC, ReverSave, SatRIC, SIEGET, SINDRION, SIPMOS, SMARTi, SmartLEWIS, SOLID FLASH, TEMPFET, thinq!, TRENCHSTOP, TriCore, X-GOLD, X-PMU, XMM, XPOSYS. 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. Mifare of NXP. 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 21-1-26 Data Sheet 3 Revision 2.1, 211-4-27
Table of Contents Table of Contents Table of Contents................................................................ 4 List of Figures................................................................... 5 List of Tables.................................................................... 6 1 Features........................................................................ 7 2 Maximum Ratings................................................................ 8 3 Thermal Characteristics........................................................... 9 4 Electrical Characteristics......................................................... 1 4.1 DC Characteristics............................................................... 1 5 Basic Application Information..................................................... 11 6 Package Information............................................................ 16 Data Sheet 4 Revision 2.1, 211-4-27
List of Figures List of Figures Figure 1 Pin out........................................................................ 7 Figure 2 Total Power Dissipation.......................................................... 9 Figure 3 BCR25W supply current vs. supply voltage (T A =25 C)................................ 1 Figure 4 3 ma Application using BCR18.................................................. 11 Figure 5 5 ma Application using BC817K-4............................................... 11 Figure 6 LED Current vs. Supply Voltage in 1 LED Application with BCR18....................... 13 Figure 7 LED Current vs. Ambient Temperature in 1 LED Application with BCR18.................. 13 Figure 8 Drop Voltage vs. LED current in 1 LED Application with BCR18......................... 13 Figure 9 LED Current vs. Supply Voltage in 1 LED Application with BC817K-4..................... 14 Figure 1 LED Current vs. Ambient Temperature in 1 LED Application with BC817K-4............... 14 Figure 11 Drop Voltage vs. LED current in 1 LED Application with BC817K-4....................... 14 Figure 12 LED Current vs. Supply Voltage in 3 LED Application with BC817K-4..................... 15 Figure 13 LED Current vs. Ambient Temperature in 3 LED Application with BC817K-4............... 15 Figure 14 Drop Voltage vs. LED current in 3 LED Application with BC817K-4....................... 15 Figure 15 Package outline............................................................... 16 Figure 16 Recommended PCB Footprint for Reflow Soldering................................... 16 Figure 17 Tape Loading................................................................. 16 Data Sheet 5 Revision 2.1, 211-4-27
List of Tables List of Tables Table 1 Maximum Ratings.............................................................. 8 Table 2 Maximum Thermal Resistance.................................................... 9 Table 3 DC Characteristics............................................................. 1 Table 4 DC Characteristics with BCR18.................................................. 12 Table 5 DC Characteristics with BC817K-4............................................... 12 Data Sheet 6 Revision 2.1, 211-4-27
1 Features Wide input voltage range 1.8-18 V Ultra low voltage overhead of only.2 V LED current 5 ma to 8 ma with external transistor Tailored to drive.1 W -.2 W LEDs Typical 3 % LED current accuracy Small Package: SOT343 SOT343-3D Applications Channel letters for advertising LED strips for decorative lighting Aircraft, train, ship illumination Refrigerator, white goods lighting Architectural lighting Description The BCR25W is an easy to use LED Controller requiring a minimum supply voltage that is only.2 V higher than the forward voltage of the LEDs. This enables the possibility to connect the maximum amount of LEDs in series with available supply voltage. The LED current is supplied via an external transistor and adjusted by a sense resistor. 4 Sense 3 Iout 1 2 Vs GND Figure 1 Pin out Product Name Package Pin Configuration Marking BCR25W SOT343 1 = Vs 2 = GND 3 = Iout 4 = Sense W7s Data Sheet 7 Revision 2.1, 211-4-27
Maximum Ratings 2 Maximum Ratings Table 1 Maximum Ratings Parameter Symbol Values Unit Note / Min. Typ. Max. Test Condition Supply voltage V s 18 V Output current I out.5 ma Total power dissipation, T s 13 C P tot 1 mw Junction temperature T J 15 C Storage temperature range T STG -65 15 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. Data Sheet 8 Revision 2.1, 211-4-27
Thermal Characteristics 3 Thermal Characteristics Table 2 Maximum Thermal Resistance Parameter Symbol Values Unit Note / Min. Typ. Max. Test Condition Junction - soldering point 1) R thjs 47 K/W 1) For calculation of R thja please refer to application note AN77, Thermal Resistance Calculation Total Power Dissipation P tot = f (T S ) 12 1 8 Ptot (mw) 6 4 2 2 4 6 8 1 12 14 16 T S ( C) Figure 2 Total Power Dissipation Data Sheet 9 Revision 2.1, 211-4-27
Electrical Characteristics 4 Electrical Characteristics 4.1 DC Characteristics All parameters at T A = 25 C, unless otherwise specified. Table 3 DC Characteristics Parameter Symbol Values Unit Note / Min. Typ. Max. Test Condition Device supply current I S 75 2 µa V S = 3 V, I OUT = A Device supply current I S 3 6 µa V S = 18 V, I OUT = A Minimum supply voltage V Smin 1.8 V 35 BCR25W supply current IS [µa] 3 25 2 15 1 5 2 4 6 8 1 12 14 16 18 2 V S [V] Figure 3 BCR25W supply current vs. supply voltage (T A =25 C) Data Sheet 1 Revision 2.1, 211-4-27
Basic Application Information 5 Basic Application Information BCR25W is an easy to use LED Controller requiring just an external sense resistor and transistor to control the LED current. Subsequent application examples show the electrical measurement results of BCR25W controlling 1 respective 3 LEDs with an external transistor BCR18 or BC817K-4. Vsupply 5 V BCR25W R1 3.3 Ohm 1nF 1 Vs 2 GND 4 Sense 3 Iout T1 BCR18 Figure 4 3 ma Application using BCR18 Vsupply 12 V BCR25W R1 2.2 Ohm 1nF 1 Vs 2 GND 4 Sense 3 Iout T1 BC817K-4 R2 47 kohm Figure 5 5 ma Application using BC817K-4 Data Sheet 11 Revision 2.1, 211-4-27
Basic Application Information Table 4 DC Characteristics with BCR18 Parameter Symbol Values Unit Note / Min. Typ. Max. Test Condition LED current I LED 32 ma R 1 = 3.3 Ω, V S = 5 V Voltage drop at resistor R 1 V drop 14 mv R 1 = 3.3 Ω, V S = 5 V Change of I LED versus V S I C / V S 2.4 %/V R 1 = 3.3 Ω, V S = 5 V Change of I LED versus T A R 1 = 3.3 Ω, V S = 5 V I C / T A.4 %/K Table 5 DC Characteristics with BC817K-4 Parameter Symbol Values Unit Note / Min. Typ. Max. Test Condition LED current I LED 48 ma R 1 = 2.2 Ω, V S = 12 V Voltage drop at resistor R 1 V drop 17 mv R 1 = 2.2 Ω, V S = 12 V Change of I C versus V S I C / V S 1.4 %/V R 1 = 2.2 Ω, V S = 12 V Change of I C versus T A R 1 = 2.2 Ω, V S = 12 V I C / T A.4 %/K Data Sheet 12 Revision 2.1, 211-4-27
Basic Application Information 6 BCR18 with 1 LED ILED [ma] 5 4 3 2 1 2. 2.5 3. 3.5 4. 4.5 5. 5.5 6. V S [V] 1.8 Ω 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω Figure 6 LED Current vs. Supply Voltage in 1 LED Application with BCR18 6 BCR18 with 1 LED (V S = 5 V) ILED [ma] 5 4 3 2 1 4 2 2 4 6 8 1 12 T A [ C] 1.8 Ω 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω Figure 7 LED Current vs. Ambient Temperature in 1 LED Application with BCR18 25 BCR18 with 1 LED (V S = 5 V) 2 Vdrop [mv] 15 1 5 125 C 25 C 4 C 1 2 3 4 5 I LED [ma] Figure 8 Drop Voltage vs. LED current in 1 LED Application with BCR18 Data Sheet 13 Revision 2.1, 211-4-27
Basic Application Information BC817K 4 with 1 LED 5 45 4 ILED [ma] 35 3 25 2 15 1 5 2 2.5 3 3.5 4 4.5 5 5.5 6 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω V S [V] Figure 9 LED Current vs. Supply Voltage in 1 LED Application with BC817K-4 7 BC817K 4 with 1 LED (V S = 5 V) ILED [ma] 6 5 4 3 2 1 4 2 2 4 6 8 1 12 T A [ C] 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω Figure 1 LED Current vs. Ambient Temperature in 1 LED Application with BC817K-4 25 BC817K 4 with 1 LED (V S = 5 V) 2 Vdrop [mv] 15 1 5 125 C 25 C 4 C 1 2 3 4 5 6 I LED [ma] Figure 11 Drop Voltage vs. LED current in 1 LED Application with BC817K-4 Data Sheet 14 Revision 2.1, 211-4-27
Basic Application Information ILED [ma] 8 7 6 5 4 3 2 1 BC817K 4 with 3 LEDs 8 1 12 14 16 18 V S [V] 1.2 Ω 1.5 Ω 1.8 Ω 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω Figure 12 LED Current vs. Supply Voltage in 3 LED Application with BC817K-4 ILED [ma] BC817K 4 with 3 LEDs (V S = 12 V) 1 9 8 7 6 5 4 3 2 1 4 2 2 4 6 8 1 12 T A [ C] 1.2 Ω 1.5 Ω 1.8 Ω 2.2 Ω 2.7 Ω 3.3 Ω 3.9 Ω 6.8 Ω 15 Ω 33 Ω Figure 13 LED Current vs. Ambient Temperature in 3 LED Application with BC817K-4 25 BC817K 4 with 3 LEDs (V S = 12 V) 2 Vdrop [mv] 15 1 5 125 C 25 C 4 C 1 2 3 4 5 6 I LED [ma] Figure 14 Drop Voltage vs. LED current in 3 LED Application with BC817K-4 Data Sheet 15 Revision 2.1, 211-4-27
Package Information 6 Package Information 4 2 ±.2 1.3 3.1 MAX..1.9 ±.1 A.3 +.1 -.5 4x.1 M 1.15 2 +.1.6 -.5 2.1±.1.1 MIN..2 M A.15 +.1 -.5 1.25 ±.1 SOT343-PO V8 Figure 15 Package outline.6 1.6.8 1.15.9 SOT343-FP V8 Figure 16 Recommended PCB Footprint for Reflow Soldering 4.2 2.3 8 Pin 1 2.15 1.1 SOT323-TP V2 Figure 17 Tape Loading Data Sheet 16 Revision 2.1, 211-4-27
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