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BCR401UW6 document number: ds38542 rev. 3 - 2 1 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 10 to 100ma led constant current regulator in sot26 (sc74r) description 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 ccr is fully integrated into a sot26 (sc74r) minimizing pcb area and component count. applications constant current regulation (ccr) in: ? emergency lighting ? signage , advertising, decorative and architectural lighting ? retail lighting in fridge, freezer case and vending machines features ? led constant current regulator using pnp emitter-follower wit h emitter resistor to current limit ? i out = 10ma 10% constant current (preset) ? i out up to 100 ma adjustable with an 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 current ? 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 ? an automotive-compliant part is available under separate datasheet ( BCR401UW6q ) mechanical data ? case: sot26 (sc 74 r) ? case m aterial: molded plastic. green molding compound. ul flammability rating 94v-0 ? moisture sensitivity: level 1 per j-std- 020 ? terminals: finish C matte tin plated leads, solderable per mil-std-202, method 208 ? weight: 0. 018 grams (approximate) ordering information (note 4) product marking reel size (inches) tape width (mm) quantity per reel BCR401UW6-7 401 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 bro mine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. 4. for packaging details, go to our website at http://www.diodes.com/produ cts/packages.html. pin name pin function v s supply voltage out regulated output current r ext external resistor for adjusting output current gnd power g round sot26 (sc74r) top view pin-out top view gnd out out r ext v s out internal device schematic e3
BCR401UW6 document number: ds38542 rev. 3 - 2 2 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 marking information date code key year 2017 2018 2019 2020 2021 2022 202 3 code e f g h i j k 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 5) p d 1,190 mw (note 6) 912 thermal resistance, junction to ambient (note 5) r ja 1 05 c/w ? (note 6) 1 37 thermal resistance, junction to lead (note 7) 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 8) 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: 5. for a device mounted with the out leads on 50mm x 50mm 2oz copper that is on a single-sided 1.6mm fr4 pcb; device is measured under still air conditions while operating in steady-state. 6. same as note 5, except mounted on 15mm x 15mm 1oz copper. 7 . r jl = thermal resistance from junction to solder-point (at the end of the out leads ). 8 . 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)
BCR401UW6 document number: ds38542 rev. 3 - 2 3 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 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 91 104 ? 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 change vs. temperature i out /i out -0.25 %/c v s = 10v output current change vs. supply voltage i out /i out 1 %/v v s = 10v
BCR401UW6 document number: ds38542 rev. 3 - 2 4 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 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)
BCR401UW6 document number: ds38542 rev. 3 - 2 5 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 typical electrical characteristics (continued) (@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 150c 85c 25c -40c 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 ohms 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 (c) r ext (ohms) r ext =15 ohms r ext = 33 ohms r ext = 100 r ext =22 ohms r ext =18 ohms r ext =51 ohms v s vs i out v s -v out =1.4v v s (v) r ext = 100 r ext =51 ohms r ext =22 ohms r ext =18 ohms r ext =15 ohms r ext (ohms)vs i out 150c r ext = open v s -v out =1.4v r ext = open 85c 25c -40c 85c 25c -40c v s (v)
BCR401UW6 document number: ds38542 rev. 3 - 2 6 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 application information figure 1 typical application circuit for bcr40x led driver figure 2 application circuit for increasing led current 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 bcr410/2/5s. in applications where curren t 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 fact ored 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 acros s 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 upo n the pcb board material, the copper area and the ambient tempera ture. the maximum dissipation the device can handle is given by: p d = (tj (max) - t a ) / r ja refer to the thermal characteristic graphs in datasheet for selecting the appropriate pcb copper area.
BCR401UW6 document number: ds38542 rev. 3 - 2 7 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 application information (continued) pwm is the most pursued method for led dimming. in th e pwm method, dimming is achieved by turning the leds on a nd off for a portion of a single cycle. pwm dimming can be achieved by enabling/disabling t he led driver itself (refer to figure 3a, 3b) or by swit ching the power path on and off (refer to figure 3c). the pwm signal can be provided by a micro-controller or analog circuitry; typical circuits ar e shown in figure 3. figure 4 is a typical response of led current vs. pwm duty c ycle, pwm method showed in figure 3b is used for generat ing the graphs. figure 3a figure 3b figure 3c fig ure 3a, 3b & 3c application circuits for led driver with pwm dimming functionality
BCR401UW6 document number: ds38542 rev. 3 - 2 8 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 application information (cont.) fig ure 4 typical led current response vs. pwm duty cycle for 25khz, 10khz and 1khz pwm frequency (refer to figure 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
BCR401UW6 document number: ds38542 rev. 3 - 2 9 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 application information (cont.) the error between the calculated theoretical value and the measured value is due to the turn on and turn off times of the bcr401/2/5. there will be a small contribution from the switches (a pre-biased transis tor or a mosfet) shown in figure 3a and 3b towards the tota l turn on and turn off times of the bcr401/2/5. it is recommended to keep t he external switching delays to the lowest possible value to im prove pwm accuracy. the typical switching times of the bcr401/2/5 for the configurat ion shown in figure 3b are: turn-on time = 200ns turn-off time = 10s please refer to the figure 5 and 6 for the switching time per formance. 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-on time of bcr401/2/5 (pwm method shown in figu re 3b) figure 6 turn-on 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
BCR401UW6 document number: ds38542 rev. 3 - 2 10 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 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 figur e 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
BCR401UW6 document number: ds38542 rev. 3 - 2 11 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 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 diss ipates 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 maximizing th e 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
BCR401UW6 document number: ds38542 rev. 3 - 2 12 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 package outline dimensions 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 suggested pad layout please see http://www.diodes.com/package-outlines.html for the latest version. sot26 (sc74r) 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
BCR401UW6 document number: ds38542 rev. 3 - 2 13 of 13 www.diodes.com may 2017 ? diodes incorporated BCR401UW6 important notice diodes incorporated makes no warranty of any kind, express 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, correct ions or other changes without further notice to this document and any produc t described herein. diodes incorporated does not assume a ny 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 custome r or user of this document or products described here in 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 repres ented 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, cust omers 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. pro duct 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 in to multiple languages for reference. only the english vers ion 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 devic es 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 s ystems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use 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 incor porated 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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