LED Driver Features Continuous output current up to 5m with external resistor Suitable for supply voltages of 4V and above Low side current control, µc compatible PWM input (BCR42U) up to khz Up to W power dissipation in a small SC74 package Negative thermal coefficient reduces output current at higher temperatures Easy paralleling of drivers to increase current Pbfree (RoHS compliant) package utomotive qualified according EC Q pplications rchitectural LED lighting Channel letters for advertising, LED strips for decorative lighting Retail lighting in fridge, freezer case and vending machines Emergency lighting (e.g. steps lighting, exit way signs etc.) Ship, train and aircraft interior illumination 4 5 6 3 2 General Description The BCR42U/BCR42U provide a lowcost solution for driving.25w LEDs with a typical LED current ILED of 75m to 5m. Internal breakdown voltage is >4V, this is the maximum voltage that the LED driver IC can sustain when connected to it directly. The BCR42U/BCR42U can be operated at supply voltages of 4V or higher, by simply stacking a series of LEDs in front of the LED drivers, resulting in a certain voltage drop depending on the forward voltages of the LEDs, reducing the voltage at the supply pin of the driver below 4V. digital input pin (BCR42U) allows dimming via a Microcontroller with frequencies of up to khz. reduction of the output current at higher temperatures is the result of the negative thermal coefficient of.2% /K. of the LED drivers. With no need for additional external components like inductors, capacitors and free wheeling diodes, the BCR42U/BCR42U LED drivers are a costefficient and PCBarea saving solution for driving.25w LEDs. 25
Pin Configuration Typical pplication +Vs 6 5 4 µc EN IEN OUT IOUT 2,3,5 2 3 Rext 6 GND 4 Vdrop BCR42U Type Marking Pin Configuration Package BCR42U BCR42U 4 4 = EN 2;3;5 = OUT 4 = GND 6 = R ext SC74 SC74 Maximum Ratings Parameter Symbol Value Unit Enable voltage BCR42U BCR42U V 4 4.5 Output current I out 2 m Output voltage 38 V Reverse voltage between all terminals V R.5 Total power dissipation, T S = C P tot mw Junction temperature T j 5 C Storage temperature T stg 65... 5 Thermal Resistance Parameter Symbol Value Unit Junction soldering point ) R thjs 5 K/W For calculation of RthJ please refer to pplication Note Thermal Resistance 2 25
Electrical Characteristics at T =25 C, unless otherwise specified Parameter Symbol Values Unit min. typ. max. Characteristics Collectoremitter breakdown voltage I C = m, I B = V BR(CEO) 4 V Enable current I EN m = 24 V, BCR42U.2 = 3.3 V, BCR42U.2 DC current gain I C = 5 m, V CE = V Internal resistor I Rint = m h FE 2 35 5 R int 65 9 5 Ω Bias resistor R B kω BCR42U 2 BCR42U.5 Output current I out m =.4 V, = 24 V, BCR42U 8 2 =.4 V, = 3.3 V, BCR42U 8 2 > 2. V, = 24 V, R EXT = 5. Ω, BCR42U 5 > 2. V, = 3.3 V, R EXT = 5. Ω, BCR42U 5 Voltage drop (V S V E ) I out = m DC Characteristics with stabilized LED load Lowest sufficient supply voltage overhead I out > 8m V drop.85.95.5 V V Smin.4 V Output current change versus T / %/K = 24 V; > 2. V, BCR42U.2 = 3.3 V; > 2. V, BCR42U.2 Output current change versus V S = 24 V; > 2. V, BCR42U / %/V = 3.3 V; > 2. V, BCR42U 3 25
Total power dissipation P tot = f (T S ) Permissible Pulse Load R thjs = f (t p ) 2 mw 3 P tot 9 8 7 6 5 4 3 2 RthJS 2 D =,5,2,,5,2,,5 2 4 6 8 2 C 5 T S 6 5 4 3 2 s T P Permissible Pulse Load P totmax / P totdc = f (t p ) 3 Ptotmax/PtotDC 2 D =.5..2.5..2.5 6 5 4 3 2 s T P 4 25
BCR42U: Output current versus I out = f ( ); = 4 V; R ext = Parameter.2 BCR42U: Output current versus R ext I out = f (R ext ); = 24 V; I out = ; = Parameter.2 Rext = 6 Ohm Vout = 5.4V Vout =.4V Rext = 8 Ohm Rext = Ohm. Rext = 5 Ohm Rext = 3 Ohm.5 Rext = open 2 4 6 8 V 2 Ohm 2 R ext. BCR42U: Output current versus I out = f (V S ); = 4 V; R ext = open; T = Parameter.5 T = 4 C T = 25 C T = 85 C BCR32U: Output current versus I out = f (V S ); = 4 V; R ext = 2 Ohm; T = Parameter.8.4.5.2 T = 4 C T = 25 C T = 85 C 2 4 6 8 V 2 2 4 6 8 V 2 5 25
BCR42U: Output current versus I out = f (V S ); = 4 V; R ext = 6 Ohm; T = Parameter.2 BCR42U: Output current versus I out = f ( ); = 2. V; R ext = open; T = Parameter.2 T = 4 C T = 25 C T = 85 C...5 T = 4 C T = 25 C T = 85 C.5 2 4 6 8 V 2 5 5 2 V 3 BCR42U: Output current versus I out = f ( ); = 2. V; R ext = 2 Ohm; T = Parameter.6 BCR42U: Output current versus I out = f ( ); = 2. V; R ext = 6 Ohm; T = Parameter.5.4.3 T = 4 C T = 25 C T = 85 C T = 85 C T = 25 C T = 4 C.2.5. 5 5 2 V 3 5 5 2 V 3 6 25
BCR42U: Output current versus I out = f ( ); = 2. V; R ext = Parameter.5 BCR42U: Enable current versus I EN = f ( ); R ext = open; I out = ; T = Parameter 3 Rext = 6 Ohm Rext = 8 Ohm Rext = Ohm IEN m.5 Rext = 3 Ohm T = 8 C T = 25 C T = 4 C Rext = 6 Ohm Rext = open 5 5 2 V 3.5.5 2 2.5 3 3.5 4 Ohm 5 BCR42U: Output current versus I out = f ( ); = 3.3 V; R ext = Parameter.2 BCR42U: Output current versus R ext I out = f (R ext ); = 3.3 V; = Parameter.2 Rext = 6 Ohm Rext = 8 Ohm Rext = Ohm. Vout = 5.4V Vout =.4V Rext = 5 Ohm Rext = 3 Ohm.5 Rext = open 2 4 6 8 V 2 Ohm 2 R ext. 7 25
BCR42U: Output current versus I out = f (V S ); = 3.3 V; R ext = open; T = Parameter.5 BCR42U: Output current versus I out = f (V S ); = 3.3 V; R ext = 2 Ohm; T = Parameter.6 T = 4 C T = 25 C T = 85 C T = 4 C T = 25 C T = 85 C.5.2 2 4 6 8 V 2 2 4 6 8 V 2 BCR42U: Output current versus I out = f (V S ); = 3.3 V; R ext = 6 Ohm; T = Parameter.2 BCR42U: Output current versus I out = f ( ); = 2. V; R ext = open T = Parameter.2 T = 4 C T = 25 C T = 85 C...5 T = 4 C T = 25 C T = 85 C.5 2 4 6 8 V 2 2 3 V 5 8 25
BCR42U: Output current versus I out = f ( ); = 2. V; R ext = 2 Ohm T = Parameter.6 BCR42U: Output current versus I out = f ( ); = 2. V; R ext = 6 Ohm T = Parameter.5.4.3 T = 4 C T = 25 C T = 85 C.2..5 T = 85 C T = 25 C T = 4 C 2 3 V 5 2 3 V 5 BCR42U: Output current versus I out = f ( ); V S = 3.3 V; R ext = Parameter BCR42U: Enable current versus I EN = f ( ); R ext = open; I out = T = Parameter.5 Rext = 6 Ohm 3 Rext = 9 Ohm Rext = Ohm m IEN.5 Rext = 3 Ohm T = 8 C T = 25 C T = 4 C Rext = 6 Ohm Rext = open 2 3 V 5.5.5 2 2.5 3 3.5 4 Ohm 5 9 25
pplication circuit: Enabling / PWM by micro controller pplication circuit: Enabling by connecting to Vs +Vs +Vs µc EN IEN OUT IOUT 2,3,5 EN IEN OUT IOUT 2,3,5 Rext 6 Rext 6 GND 4 Vdrop GND 4 Vdrop BCR42U BCR42U pplication hints serve as an easy to use constant current sources for LEDs. In stand alone application an external resistor can be connected to adjust the current from m to 5 m. R ext can be determined by using the diagram 'Output current versus external resistor'. 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 for application notes: www.infineon.com/lowcostleddriver for uptodate application information 25
Package SC74 Package Outline 2.9 ±.2 (2.25) B (.35) +..5.6. MX. Pin marking 6 5 4 2 3 +..35.5.95.9.2 M B 6x ±. ±. 2.5.25 MX..2 M MX.. MX..6 ±. Foot Print.5.9 2.9.95 Marking Layout (Example) Small variations in positioning of Date code, Type code and Manufacture are possible. Manufacturer 25, June Date code (Year/Month) Pin marking Laser marking BCW66H Type code Standard Packing Reel ø8 mm = 3. Pieces/Reel Reel ø33 mm =. Pieces/Reel For symmetric types no defined Pin orientation in reel. 4.2 2.7 8 Pin marking 3.5.5 25
Edition 296 Published by Infineon Technologies G 8726 Munich, Germany 29 Infineon Technologies G ll 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 noninfringement 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 lifesupport 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 lifesupport 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. 2 25