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BCR401UW6Q document number: ds38938 rev. 1 - 2 1 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q 10ma to 100ma led constant current regulator in sot26/sc74r description this linear led driver is designed to meet the stringent require ments of automotive applications. the bcr401u monolithically integrates a transistor, diodes and resistors to function as a constant current regulator (c cr) for led driving. the device regulates with a preset 10ma nominal that c an be adjusted with external resistor up to 10 0ma. it is designed for driving leds in strings and will reduce current at increasing tempera tures to self-protect. operating as a series linear ccr for led st ring current control, it can be used in applications with supply voltag es up to 40v. with no need for additional external components, this c cr is fully integrated into a sot26/sc74r minimizing pcb area and compon ent count. applications constant current regulation (ccr) in automotive led lighting: ? interior and exterior automotive led lighting ? dome and mood lighting ? puddle lighting ? side marker lights features ? led constant current regulator using pnp emitter-follower with emitter resistor to current limit ? i out = 10ma 10% constant current (preset) ? i out up to 100 ma adjustable with a n external resistor ? v s C 40v supply voltage ? p d up to 1w in sot26/sc74r ? led dimming using pwm up to 25khz ? negative temperature coefficient (ntc) reduces i out with increasing temperature ? parallel devices to increase regulated c urrent ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. green device (note 3) ? qualified to aec-q101 standards for high reliability ? ppap capable (note 4) mechanical data ? case: sot26/ sc 74 r ? case material: molded plastic. Dgreen molding compound. ul flammability rating 94v-0 ? moisture sensitivity: level 1 per j-std- 020 ? terminals: finish - matte tin plated leads, solderable per mil-std-202, method 208 ? weight: 0. 018 grams (approximate) ordering information (note 5) part number compliance marking reel size (inches) tape width (mm) quantity per r eel BCR401UW6Q-7 automotive 401 7 8 3, 000 note s: 1 . no purposely added lead. fully eu directive 2002/95/ec (rohs) & 2011 /65/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more information about diodes incorporateds definitions of hal ogen- and antimony-free, "green" and lead-free. 3. halogen- and antimony- free "green products are defined as those which contain < 900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. 4. automotive products are aec-q101 qualified and are ppap capab le . refer to http://www.diodes.com/product_compliance_definitions.html. 5. for packaging details, go to our website at http://www.diodes.com/prod ucts/packages.html. pin name pin function v s supply voltage out regulated output current rext external resistor for adjusting output current gnd power g round sot26/sc74r top view pin-out top view gnd out out rext v s out internal device schematic
BCR401UW6Q document number: ds38938 rev. 1 - 2 2 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q marking information date code key year 2016 2017 2018 2019 2020 2021 2022 code d e f g h i j month jan feb mar apr may jun jul aug sep oct nov dec code 1 2 3 4 5 6 7 8 9 o n d absolute maximum ratings (voltage relative to gnd, @t a = +25c, unless otherwise specified.) characteristic symbol value unit supply voltage v s 40 v output current i out 10 0 ma output voltage v out 40 v reverse voltage between all terminals v r 0.5 v thermal characteristics characteristic symbol value unit power dissipation (note 6) p d 1,190 mw (note 7) 912 thermal resistance, junction to ambient (note 6) r ja 1 05 c/w ? (note 7) 1 37 thermal resistance, junction to lead (note 8) r jl 50 recommended operating junction temperature range t j - 55 to +150 c maximum operating junction and storage temperature range t j , t stg -65 to +150 esd ratings (note 9) characteristics symbols value unit jedec class electrostatic discharge C human body model esd hbm 800 v 1b electrostatic discharge C machine model esd mm 300 v b notes: 6. for a device mounted with the out leads on 50mm x 50mm 2oz copper that is on a single-sided 1.6mm fr-4 pcb; device is measured un der still air conditions while operating in steady-state. 7 . same as note 6, except mounted on 15mm x 15mm 1oz copper. 8 . r jl = thermal resistance from junction to solder-point (at the end of the out leads ). 9 . refer to jedec specification jesd22-a114 and jesd22-a115 . 401 = part marking (see ordering information) ym = date code marking y = year (ex: d = 2016) m = month (ex: 9 = september) 401 sot26/sc74r
BCR401UW6Q document number: ds38938 rev. 1 - 2 3 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q electrical characteristics (@ t a = +25c, unless otherwise specified.) characteristic symbol min typ max unit test condition collector-emitter breakdown voltage bv ceo 40 v i c = 1ma gnd (enable) current i gnd 340 420 500 a v s = 10v; v out = open gnd (enable) current i gnd 380 a v s = 10v; v out = 8.6v dc current gain h fe 100 220 470 i c = 50ma; v ce = 1v internal resistor r int 78 104 ? i rint = 10ma output current (nominal) i out 9 10 11 ma v out = 8.6v; v s = 10v voltage drop (v rext ) v drop 0.91 v i out = 10ma lowest sufficient supply voltage (v s- v out) v smin 1. 4 v i out > 8ma output current c hange versus temperature i out /i out - 0.25 %/c v s = 10v output current c hange versus supply voltage i out /i out 1 %/v v s = 10v
BCR401UW6Q document number: ds38938 rev. 1 - 2 4 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q typical thermal characteristics (@ t a = +25c, unless otherwise specified.) 100 1000 0 100 200 300 400 500 600 700 800 rth(ja) vs cu area copper area (mm 2 ) 100 1m 10m 100m 1 10 100 1k 0 25 50 75 100 125 t amb =25c 50mm * 50mm 1oz cu transient thermal impedance d=0.5 d=0.2 d=0.1 single pulse d=0.05 thermal resistance (c/w) pulse width (s) 100 1m 10m 100m 1 10 100 1k 1 10 t amb =25c 50mm * 50mm 1oz cu single pulse pulse power dissipation pulse width (s) maximum power (w) 100 1m 10m 100m 1 10 100 1k 0 25 50 75 100 125 150 t amb =25c 25mm * 25mm 1oz cu transient thermal impedance d=0.5 d=0.2 d=0.1 single pulse d=0.05 thermal resistance (c/w) pulse width (s) 100 1m 10m 100m 1 10 100 1k 1 10 single pulse t amb =25c 25mm * 25mm 1oz cu pulse power dissipation pulse width (s) maximum power (w) 0 50 100 150 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 rth(ja) (c/w) 25mm * 25mm 1oz cu 50mm * 50mm 1oz cu derating curve temperature (c) max power dissipation (w)
BCR401UW6Q document number: ds38938 rev. 1 - 2 5 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q typical electrical characteristics (@t a = +25c, unless otherwise specified.) 0 5 10 15 20 25 30 35 40 0 2 4 6 8 10 12 14 20 40 60 80 100 0 10 20 30 40 50 60 5 10 15 20 25 30 35 40 1 20 40 60 80 -25 0 25 50 75 100 125 150 -20 0 20 40 60 80 0 5 10 15 20 25 30 35 40 0 5 10 15 0 5 10 15 20 25 30 35 40 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 v s -v out =1.4v to 2v v s -v out =1v v s =10v v s -v out =1.4v & v s = 10v 150 o c 85 o c 25 o c -40 o c v s -v out =1.4v i s (ma) i out (ma) i out (ma) i out (ma) i out (ma) i out (ma) r ext = 33 ? v s vs i s v s (v) v s vs i out v s vs i out v s (v) t j vs i out t j ( o c) r ext ( ? ) r ext =15 ? r ext = 33 ? r ext = 100 ? r ext =22 ? r ext =18 ? r ext =51 ? v s vs i out v s -v out =1.4v v s (v) r ext = 100 ? r ext =51 ? r ext =22 ? r ext =18 ? r ext =15 ? r ext ( ? ) vs i out 150 o c r ext = open v s -v out =1.4v r ext = open 85 o c 25 o c -40 o c 85 o c 25 o c -40 o c v s (v)
BCR401UW6Q document number: ds38938 rev. 1 - 2 6 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information figure 1. typical application circuit for bcr40x led driver figure 2. application circuit for increasing led current the bcr401/2/5 are designed for driving low current leds with typical led currents of 10ma to 100ma. they provide a cost-effect ive way for driving low current leds compared with more complex switching regulator solutions. furthermore, they reduce the pcb boar d area of the solution as there is no need for external components like inductors, capacitors and switching diodes. fig ure 1 shows a typical application circuit diagram for driving a n led or string of leds. the devices come with an internal resist or (r int ) of typically 91?, 20?, 16.5? which in the absence of an external resistor, sets an led current of 10ma, 20ma, 50ma respectively. le d current can be increased to a desired value by choosing an appropr iate external resistor, r ext . the r ext vs. i out graphs should be used to select the appropriate resistor. choosing a low tolerance r ext will improve the overall accuracy of the current sense formed by the parallel connection of r int and r ext. the negative temperature coefficient of the bcr series all ows easy paralleling of bcr4 01 /2/5s. in applications where current sharing is required either due to high current requirements of led st rings or for power sharing, two or more bcr401/2/5s can be connect ed in parallel as shown in figure 2. power dissipation capability must be fa ctored into the d esign, with respect to the bcr401/2/5s thermal resistance. the maximum voltage across the device can be calculated by t aking the maximum supply voltage and subtracting the voltage across the led string. v device = v s C v out p d = (v device i led ) + (v s i gnd ) as the output current of bcr401/2/5 increases, it is n ecessary to connect an appropriate heat sink to the out pins of the device. the power dissipation supported by the device is dependent u pon the pcb board material, the copper area and the ambient tempera ture. the maximum dissipation the device can handle is given by: p d = (t j(max) - t a ) / r ja refer to the thermal characteristic graphs in datashee t for selecting the appropriate pcb copper area. v s v s v s
BCR401UW6Q document number: ds38938 rev. 1 - 2 7 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information (cont.) pwm is the most pursued method for led dimming. in the pw m method, dimming is achieved by turning the leds on and off for a portion of a single cycle. pwm dimming can be achieved by enabling/disabling the led driver itself (refer to figure 3a, 3b) or by the switching the power path on and off (refer to figure 3c). the pwm signal can be pro vided by a micro-controller or analog circuitry; typical circu its are shown in figure 3. figure 4 is a typical response of led current vs. pwm d uty cycle, pwm method showed in figure 3b is used for gen erating the graphs. figure 3a figure 3b figure 3c fig ure 3a, 3b & 3c. application circuits for led driver with pwm dimming functionality v s v s v s
BCR401UW6Q document number: ds38938 rev. 1 - 2 8 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information (cont.) fig ure 4. typical led current response vs. pwm duty cycle fo r 25khz, 10khz and 1khz pwm frequency (refer to circuit 3b) 0 10 20 30 40 50 60 0 20 40 60 80 100 led current (ma) duty ratio % pwm resolution at 25khz calculated dc current measured dc current 0 10 20 30 40 50 60 0 20 40 60 80 100 led current (ma) duty ratio % pwm resolution at 10khz calculated dc current measured dc current 0 10 20 30 40 50 60 0 20 40 60 80 100 led current (ma) duty ratio % pwm resolution at 1khz calculated dc current measured dc current
BCR401UW6Q document number: ds38938 rev. 1 - 2 9 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information (cont.) the error between the calculated theoretical value and the measured value is due to the turn on and turn off ti me of the bcr401/2/5. there will be a small contribution from the switches (a pre-biased transisto r or a mosfet) shown in figure 3a and 3b towards the total turn on and turn off time of the bcr401/2/5. it is recommended to keep the ext ernal switching delays to the lowest possible value to improve p wm accuracy. the typical switching time of the bcr401/2/5 for the configuration sho wn in figure 3b is ; turn on time = 200ns turn off time = 10s please refer to the figure 5 and 6 for the switching time pe rformance. the percentage contribution of these switching delay s increases with increasing frequency and decreasing duty ratio as can be seen in figure 4. figure 5. turn o n time of bcr401/2/5 (pwm method shown in figure 3b) figure 6. turn o n time of bcr401/2/5 (pwm method shown in figure 3c) however, where possible, the switching performance of the bcr401/2/5 can be significantly improved by switching th e power path as shown in figure 3c. the resulting turn-off time is shown in figure 7. this resulted in an improved pwm resolution at 25khz as sho wn in figure 8. turn-off time = ~200ns
BCR401UW6Q document number: ds38938 rev. 1 - 2 10 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information (cont.) figure 7. turn off time of bcr401/2/5 while switching the pow er path as shown in figure 3c yellow ? pwm signal. green ? led current. blue ? no connection made to this probe channel. figure 8. pwm resolution with power path switching (refer to f igure 3c) 0 10 20 30 40 50 60 0 20 40 60 80 100 led current (ma) duty ratio % pwm resolution at 25khz calculated dc current measured dc current
BCR401UW6Q document number: ds38938 rev. 1 - 2 11 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q application information (cont.) to remove the potential of incorrect connection of the power supply damaging the lamps leds, many systems use some form of reverse polarity protection. one solution for reverse input polarity protection is to simp ly use a diode with a low v f in line with the driver/led combination. the low v f increases the available voltage to the led stack and dis sipates less power. a circuit example is presented in fig ure 9 which protects the light engine although it will not function un til the problem is diagnosed and corrected. an sdm10u45lp (0.1a/45v) is shown, providing exceptionally low v f for its package size of 1mm x 0.6mm. other reverse voltage ratings are available from diodes incorporated s website such as the sbr02u100lp (0.2a/100v) or sbr0220lp (0.2a/20v). while automotive applications commonly use this method for reverse battery protection, an alternative approach sh own in fig ure 10 , provides reverse polarity protection and corrects the reve rsed polarity, allowing the light engine to function. the bas40brw incorporates four low v f schottky diodes in a single package, reducing the power dissipated and maximizes t he voltage across the led stack. figure 9. application circuit for led driver with reverse polarity protection figure 10. application circuit for led driver with assured operation regardless of polarity v s v s
BCR401UW6Q document number: ds38938 rev. 1 - 2 12 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q package outline dimensions please see http://www.diodes.com/package-outlines.html for the latest version. sot26 / sc74r suggested pad layout please see http://www.diodes.com/package-outlines.html for the latest version. sot26 / sc74r sot26 / sc74r dim min max typ a1 0.013 0.10 0.05 a2 1.00 1.30 1.10 a3 0.70 0.80 0.75 b 0.35 0.50 0.38 c 0.10 0.20 0.15 d 2.90 3.10 3.00 e - - 0.95 e1 - - 1.90 e 2.70 3.00 2.80 e1 1.50 1.70 1.60 l 0.35 0.55 0.40 a - - 8 a1 - - 7 all dimensions in mm dimensions value (in mm) c 2.40 c1 0.95 g 1.60 x 0.55 y 0.80 y1 3.20 a1 d e e1 e b a2 a1 seating plane l c a e1 a3 c1 y1 g x y c
BCR401UW6Q document number: ds38938 rev. 1 - 2 13 of 13 www.diodes.com january 2017 ? diodes incorporated BCR401UW6Q important notice diodes incorporated makes no warranty of any kind, expres s or implied, with regards to this document, including, but not limited to, the implied warranties of me rchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, correction s or other changes without further notice to this document and any produ ct described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product des cribed herein; neither does diodes incorporated convey a ny license under its patent or trademark rights, nor the rights of others. any custom er or user of this document or products described her ein in such applications shall assume all risks of such use and will agree to hold diodes incorpo rated and all the companies whose products are represe nted on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any lia bility whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated prod ucts for any unintended or unauthorized application, cus tomers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. p roduct names and markings noted herein may also be covered by one or more unite d states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of this document is the final and determinative format released by diodes incorporat ed. life support diodes incorporated products are specifically not auth orized for use as critical components in life support dev ices or systems without the express written approval of the chief executive officer of diodes i ncorporated. as used herein: a. life support devices or systems are devices or sy stems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perfor m when properly used in accordance with instructions for u se provided in the labeling can be reasonably expected to result in signi ficant injury to the user. b. a critical component is any component in a life sup port device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect i ts safety or effectiveness. customers represent that they have all necessary exp ertise in the safety and regulatory ramifications of their lif e support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concern ing their products and any use of diodes incorporated products in such safety-criti cal, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorpo rated. further, customers must fully indemnify diodes incorpor ated and its representatives against any damages arising out of the u se of diodes incorporated products in such safety-critic al, life support devices or systems. copyright ? 2017, diodes incorporated www.diodes.com

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